Yamaha RD350 fork caps. Pop these on the crown of your forks to cap the recess. This stops dirt collecting, and adds a unique detail to your bike.
Slide an O-ring onto the bottom for a water tight seal, and another inside the loop on the underside to secure it, another option is some sealant if you're willing to fix it in place!
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Spray any colour you wish, and sand down if needed