Spring Seats .510 ID (16) For RPM Duals Valve Spring Locator - Inside - 0.030 in Thick - 1.270 in OD - 0.510 in ID - 0.680 in Spring ID - Chromoly - Set of 16

Spring Seats .570 ID (16) For RPM Duals Valve Spring Locator - Inside - 0.060 in Thick - 1.270 in OD - 0.570 in ID - 0.680 in Spring ID - Chromoly - Set of 16

Steel C/M Spring Seats - 1.550 x .700 x .575 Valve Spring Locator - Inside - 0.060 in Thick - 1.550 in OD - 0.575 in ID - 0.700 in Spring ID - Chromoly - Set of 16

Steel C/M Spring Seats - 1.270 x .870 x .575 Valve Spring Locator - Inside - 0.060 in Thick - 1.270 in OD - 0.570 in ID - 0.870 in Spring ID - Chromoly - Set of 16

Steel C/M Spring Seats - 1.500 x .730 x .575 Valve Spring Locator - Inside - 0.060 in Thick - 1.550 in OD - 0.575 in ID - 0.730 in Spring ID - Chromoly - Set of 16