Apha Racing offers these lower spring seats for using in '10-'18 BMW S1000RR / HP4 engines.  These seats are 1.3mm shorter than OEM, allowing for the use of higher lift cams without causing coil bind.  Required for use of Alpha Racing's high performance cams and valve springs for the S1000RR.

Features:

• Replaces OEM spring seats
• 1.3mm shorter construction allows for higher lift cams
• Prevents coil bind of valve springs
• Required when using Apha Racing high performance camshafts
• Sold each.