Which car? The Camaro you should be able to get underneath and just undo a few screws, likewise for the F-bird. The Corvette I can't help you on.
I recently replaced my turnsignals with some clear smoke ones from ebay,
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95 Z28 M6, 383, D1SC, FMIC, ect., ect., 614 RWHP with the stock PCM and pump gas!
98 Formula WS6 M6