Jim Carter and others used to resell kits from
Totally Stainless. Totally Stainless also sells the recessed-head front fender bolts/washers in anodized black stainless steel (but not in a kit - you order what you need). Some people believe that the original front-fender to inner-fender bolts were either blackened steel or painted-black steel.
If you want SS hardware kits or SS bolts/nuts/washers for any vehicle, you ought to check out the Totally Stainless catalog. They also have hard/strong SS bolts for intake/exhaust manifolds.
Tim