Mellow Yellow - interesting point about crimped vs. smooth upper radius. No idea for the change. Did check for leaks but found none. Thanks for bringing this point up.
If maintaining ventilation is a concern, perhaps some "covers" formulated from 1/4" hardware cloth (steel mesh) would do the trick. I installed this in my vehicles to keep mice from getting to and nesting on the cabin air filter.
Hi GreatWhiteNorth, Sorry, I didn’t see that you posed a question to me way back then. And obviously you’ve taken care of your t@b’s big booboo by now. We actually finally got ours repaired this summer and we did go with the diamond plate. The picture doesn’t do it justice but we’re very pleased with the end result. Counting down the days ‘til we can get out camping again! Feisty Smurf