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What is more common on the car is kind of a hard question to answer.

Most of the exterior of the car is 20 gauge.

(IE: Quarters, Fenders, Hood, Trunk lid.)

Roof is 18 gauge.

Radiator support: 18 gauge.

Inner Fender aprons: 20 gauge.

Firewall and front and rear floor pans: 18 gauge.

Rear Channel and trunk floors: 20 gauge

Most of the Unibodies frame is 16 guage.

What I would use is a lot easier of a question:

I'd go with 18 gauge for most all my panel repair. (Exterior and Floor pans, etc.) And go with 15-16 gauge for the actual unibodies frame repair.

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11y ago

What else can I help you with?