Will the existing holes in the fiberglass HOLD a #8 screw?...stay w/#8 if you can...if not, move up to #10s and redrill existing holes for clearance in the metal and you'll probably have to drill a little larger hole to allow a larger screw w/out cracking the gel-coat...bevel the holes to prevent cracking...
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'74 V-20/ BF 150
'95 V-21/ BF 150
'84 V-20/ 200 2.4 Merc
'87 V-20/'18 F150 Yamaha
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