I have a 78 pontiac catalina with a 400. Just wrecked it so my frame is bent a little and my driver side front fender is dented and bent. Kinda hard to find these fenders i know the Bonneville can use the same parts at least i think, but i only come across the 80s model. Wondering if there are any more interchangeable gm cars that will fit my catalina. Also wanna know what years of the catalina that i can switch parts with reagarding the fender and glove compartment or just whole dash

External sheet metal parts are often unique to the body or platform. I would not expect a fender or door from a Chevy Caprice or Buick Electra to match your Catalina. So I would stick to looking at 77-81 Bonnevilles and Catalinas to replace things like doors, fenders, and grilles. Frames you might have more luck with Olds and Chevy chassis as well, still there should be plenty of Bonneville and Catalinas lying around, especially out west.

The 77-81 Catalina and Bonneville are the 5th generation and the last truly full-size cars. This was also the final generation for the Catalina nameplate. After 1981, Pontiac discontinued the Catalina name and the Bonneville name continued on with a redesigned model. So these would be the years to look for dash, glove box, fender, and doors, in my opinion. I would also scrutinize Bonneville parts very carefully since the Bonneville was the more luxurious model, they might have more trim than the Catalina model and you might need to remove, fill, or fiddle with.

Really appreciate,u gave me a betta outlook on the car. thanks for the info.

Check this link....https://www.opgi.com/catalina/

That website stops at 76