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It was either on this site or "the other forum" that someone used longer sheet metal screws with nylon barrel spacers to accomplish the same results...cost was less than $3.00 in materials. I think it looks nice, but I decided to just seal my Z16 lights and leave them in the oem position.
Had mine on for about 8 months then took them off and sold them. I didnt like the look. All Vettes have that resest look. These do go flush and it did keep them cleaner.
Dont spend the $40.00 go to Home Depot or Lowes and get the spaces and screws there. Prob be all but $5.00, I could only find silver screws however. 3" is what you will need.