[Rick Parker]

If you dont want screw or pop rivet heads exposed here is a nifty idea. Suggest items be made out of 22 gauge stainless, have it lazer cut if you can, very neat and clean. They can also put the correct size holes in it too. Then bend to fit your particular car. Mark & drill the car body using perhaps 4 or 5 8-32 stainless machine screws keeping the holes up on the "flatter" part of the body. So the screws go straight into the side of the body keeping the screws as parallel as possible. Then (here's the trick and one of the reasons for using stainless in lieu of aluminum) thread the holes to accept the machine screws and run the heads down flush. Flip them over and carefully "silver solder" the screws into the metal use very little solder and allow it to wick into the screw threads in the metal "horseshoe". Then carefully grind off the heads leaving studs on the back of the "horseshoe". Metal finish the "horseshoe" and you will not be able to see how it is attached when installed because the studs will not be visable, and the stainless will not discolor with age as aluminum will.
Details........

Rick