ARP BMW Main Stud Kit - M50/M52 CHOPCXS medium and large fits the

medium and large fits the following Bell SA2010 Helmets:

This allows a cleaner flow of water/methanol to be passed into the engine

Puller threads onto valve stem and properly pulls rubber valve stems into place

A back and forth wiping motion will tend to leave lint from the rag on the visor

ARP BMW Main Stud Kit - M50/M52 CHOPCXS medium and large fits theARPs product line contains thousands of part numbers, and has expanded to include virtually every fastener found in an engine and driveline. These range from quality high performance OEM replacement parts to exotic specialty hardware for Formula 1, IndyCar, IMSA, NASCAR and NHRA drag racing and marine applications. Since 1968, ARP is the fastener of champions and the world leader in fastener technology. Product Description: Main Stud Kit 12 Point Nuts