Originally Posted by 64Joker
In preparing for my interior project, I removed two hard cardboard pieces from slots that run up/down behind the 2 doors (back side windows to floor) please see attached pic. It appears these are used for tacking interior material trim. Can someone tell me if these are sold as after market products or do interior shops just replace the originals with their stock? Thanks in advance..
Car: Impala SS
Those are tacking strips made from fiber board and are usually 1/4 to 3/8" thick, and about 1/2" wide. In your case, they are used to staple windlace on the door openings. I used to replace them when needed with waterproof panel board strips laminated together with glue, but found that PVC foamboard strips work much better. PVC foamboard (brand names are Sintra, Komatex, and Celtec - available at most sign shops.) cuts easily with regular woodworking tools, including a table saw, and is totally waterproof. It also comes in all kinds of thicknesses, so if you don't want to laminate the strips together, you can get a piece that is the right thickness. It's also half the weight of solid PVC, and is a lot less expensive. It's available on line HERE
I'm not crazy about using plywood of any kind in a car interior. There are much better choices that are waterproof. Also, cutting plywood into strips only 1/2" wide makes it very weak.