Remove the wheel and the fender liner and you will have access to the bolt. The fender liner is plastic or rubber and has four bolts, three in the side and one on the bottom at the back. Be careful as the fender liner may be brittle after all of these years. Replacement liners are about $100 give or take a few dollars. Good luck.

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N. Hodges
1994 S350
1987 300 SDL (for sale)