The foam I used I got from local hardware stores like lowes, home depot, ect. There are a few different sizes. I'll take a look in the morning, and see if I can get the different sizes of foam I ended up using for the project. Most all of it was just the simple "open cell" foam you can get from any of these stores.
Like you said previously, take the opportunity to carefully look at all your wiring, clean the ground points under the left hand side behind the fuse blocks, clean every electrical plug connection you see, replace burnt out cluster bulbs, and take care of any "iffys" along the way. It will head off a lot of problems/concerns in the future. Time consuming, but well worth the effort IMO. I'm sure many others have been thru this as well. Back at ya later.
This foam is just standard weatherstripping type foam, with an adhesive backing to it.