A2Z GREENSBORO · IDENTIFICATION HELP

Find your converter by vehicle brand

Choose a make to see where to look for markings. Add the year, model and engine when requesting a quote. Brand guidance narrows the search; it does not confirm the exact converter fitted to a specific vehicle.

Vehicle makeYear, if knownModel, if known

General Motors converter identification

Open this brand’s guide →

Where to find the number

Inspect the corners, edges and the center of the metal shield. Photograph every stamped line.

What to photograph

GM markings and long numeric part numbers can help. Truck, car and diesel assemblies differ; a GM marking alone does not establish the donor model.

Marking examples

126…127…253…255…

Examples and prefixes only. A matching fragment does not confirm identity, fitment or price. Send all letters, numbers and suffixes.

Gently wipe loose dirt from an already removed, cool unit. Keep shields and components together; send photos before cutting or dismantling anything.

Send this vehicle’s photos for a quote

Compare example shapes

These show general converter categories, not a verified fitment gallery for General Motors. Your original or replacement unit may look different.

Large GM Cat general shape example — Large GM Cat · view category

Small GM Cat general shape example — Small GM Cat · view category

Flow Cats general shape example — Flow Cats · view category

No code visible? Include one full-length photo, both ends, shield details, oxygen-sensor positions and any separate numbers. A2Z can review the photos. There is no automatic guaranteed valuation or exhaustive year/model converter database on this page.

Request an A2Z quote by email

Send the complete converter, both ends and close-ups of every marking. A2Z reviews the details and replies by email. No readable number? Send photos anyway.

First name *Last name *Email for your quote *Phone (optional)Vehicle year, if knownVehicle makeModel, if knownEngine / fuel, if known

Serial number / all stamped markingsNo readable number / I need identification helpConverter photos *1–6 JPEG, PNG or WebP photos. Maximum 5 MB each, 24 MB total. You can use your phone camera or photo library. Do not upload a driver’s license or other sensitive documents here.Seller category *Additional detailsI own the material or am lawfully authorized to sell it. If it was given to me, I can document the transfer and lawful source. My information is accurate.I agree to the A2Z purchase-review terms and the use of my details and photos to respond to this request. I understand this is a quote request, not an approved purchase.

ID, supporting documents, signed purchase receipt and any required fingerprint are completed and verified before a purchase. An ownership checkbox alone does not establish seller eligibility.