Try the high heat clear paints for that. I recently bought a few to do other parts like the engine and trans, which will see enough heat to ruin most paints. I was thinking of a transmission pan that I got as polished aluminum. It looked great in the pictures, and even better in hand, but it won't look nice if left bare.
Jon, have you learned of the best coating for polished AL yet? I know powder coating is out still. I want to preserve the appearance if possible, and I'd buy another one for my 98 Limited if it can be protected.
For an 8.8 cover, the later IRS Explorer covers look good too if you like them. They have lots of ribbing, and one or two plugs. Plus they used to be on eBay from someone who ground the excess mounting ears off, and finished them with paint etc. They looked nice.
I always wanted the original "SVO" rear cover, but it was obsoleted ages ago. I have the next version from FMS, Jon powder coated it black for me. Thanks Turdle.