RG500 single cilinderheads set included all O-rings (no VHM inserts included)

This set is made because the RG500 OEM mofified twin head (for VHM inserts with O-ring seals to prevent waterleakage) did not last long enough with our track bikes. this problem will be past with this single heads. You can choose VHM insetrs with 11,80 or 12.00, 12,20 and 12,40cc