You can reply with a short, clear message that puts the responsibility for fitment on the buyer while still sounding polite and professional.

Quick Scoop: What to Say

When a Facebook Marketplace buyer asks you to confirm fitment (whether a part or item will fit their car, appliance, space, etc.), your goal is:

  • Be honest about what you do know
  • Remind them they are responsible for checking fitment
  • Protect yourself from blame or returns

A simple template you can copy-paste:

“Hi, thanks for your interest. I can’t guarantee fitment for your specific vehicle/model. The part is [brand/part number/model] and was used on [your vehicle/model/year]. Please double-check fitment with this information before buying.”

You can tweak this based on your situation.

Ready‑Made Replies You Can Use

1. If you know the exact model it came from

“Hi, thanks for reaching out. This item came off a [year, make, model] and worked fine on that vehicle. I’m not able to guarantee fitment on other vehicles, so please confirm with your mechanic or an online fitment guide before buying.”

This tells them what you know without promising it will fit their setup.

2. If you don’t really know fitment

“Hi, I’m not able to confirm exact fitment for your vehicle/model. The only info I can provide is what’s in the listing: [brand, part number, dimensions, etc.]. Please use that to check with a dealer, parts store, or online fitment tool before deciding.”

This protects you if they try to blame you later.

3. If they’re pushing you to “guarantee” it

“I’m happy to share details about the item, but I can’t guarantee fitment for your specific vehicle or setup. Fitment is the buyer’s responsibility, so please only proceed if you’re sure it will work for you.”

This is firm but still polite.

4. If you want a slightly more formal, professional reply

“Thank you for your message. Unfortunately, I can’t provide a confirmed fitment guarantee for individual vehicles or applications. The item is listed with all available specifications, and I recommend confirming compatibility using the part number or measurements before purchase.”

Key Points to Include in Your Message

You don’t have to use all of these, but mixing 2–3 of them makes your reply solid:

  • Mention what you do know
    • “It was used on a 2015 Ford Focus.”
    • “It’s the OEM part number XXXXX.”
  • Clearly say you can’t guarantee fitment
    • “I can’t guarantee that it will fit your car.”
    • “I’m unable to confirm fitment for your specific model.”
  • Point them to how they can check
    • “Please confirm using the part number on an online fitment guide.”
    • “A dealer/parts store can confirm compatibility.”
  • Gently transfer responsibility
    • “Fitment is the buyer’s responsibility.”
    • “Please only proceed if you’re sure it will work for you.”

Example Scenarios (with Sample Replies)

Car part example

Buyer: “Will this fit my 2018 Honda Civic?” You:

“It was removed from a 2016 Honda Civic and fits that model. I can’t guarantee fitment on your 2018, so please double‑check the part number with your dealer or an online parts catalog before buying.”

Furniture / home item example

Buyer: “Will this fit in my hallway? It’s kind of narrow.” You:

“I don’t know your exact hallway measurements, so I can’t confirm fitment. The item is 80 cm wide and 35 cm deep. Please measure your space to make sure it will fit before buying.”

Appliance / tech example

Buyer: “Will this TV mount fit my Samsung 55”?” You:

“This mount supports TVs from 32–65 inches and uses standard VESA patterns listed in the description. I can’t guarantee it will fit your exact model, so please compare your TV’s VESA size and weight to the mount specs before buying.”

A Simple Structure You Can Reuse

When you’re not sure what to type, follow this three‑step structure:

  1. Thank + acknowledge
    • “Hi, thanks for your message / interest.”
  2. Say what you know + what you don’t know
    • “It was used on [X], but I can’t guarantee fitment for your specific [vehicle/space].”
  3. Tell them how to check + shift responsibility
    • “Please confirm using the part number/measurements with your mechanic or online guide. Fitment is the buyer’s responsibility.”

Put together, it becomes:

“Hi, thanks for your interest. The item was used on a [year/make/model] and worked fine there, but I can’t guarantee fitment for your specific setup. Please confirm using the part number and measurements with a dealer, mechanic, or online fitment guide before buying, as fitment is the buyer’s responsibility.”

TL;DR

When a Facebook Marketplace buyer asks you to confirm fitment, never promise it will fit their specific car/space. Instead:

  • Share any facts you know (model, part number, measurements).
  • Clearly say you can’t guarantee fitment.
  • Tell them to double‑check compatibility themselves.
  • Remind them that fitment is the buyer’s responsibility.

That way you stay honest, professional, and protected from “You said it would fit” problems later.