The Wilwood replacement billet master cylinder reservoir cap includes a diaphragm-style gasket and seal, machined from billet aluminum alloy with a bright finish. It fits Wilwood billet fluid reservoirs P/N 260-12696 and 260-12697 and is compatible with Wilwood master cylinder reservoirs that use Girling-size threads. Also.
Wilwood Replacement Billet Master Cylinder Reservoir Cap w/Seals