I have a set of 12+ replacement guides for this engine. Theu will fit all years and sizes of the OHV version of this engine (1972-1997?)(2.6, 2.8, 2.9, 4.0) Since they all had 8 mm guides on the valves there is only one size replacement guide used. I ordered these to rebuild a set of 2.6L heads but found that the heads had been reworked years ago and larger valves installed that used 5/16" size guides. I feel $20 shipped in the lower 48 is fair.