Dynacorn is supposed to be the premier supplier, although they may just be putting stickers on other manufacturer's products. They do however supply inner cowl panels for AD trucks that look more complete than the other patch panels. Theirs go all the way up to the hinge bolt holes, while others stop short of there and are a horrendous fit at the floor/toeboard interface. That being said, I have not actually tried a Dynacorn patch for that repair.
Like bartamos said, expect most or ALL of them to require massaging to get them to fit correctly.
