You can save a little money by going with an aftermarket gasket set, too. I think the last one I bought was $35 or so, and the seals it came with were identical to the ones I was getting in Kohler bags from my CC dealer. It does not appear that there are aftermarket oversize pistons for the M18 and M20. You can, however, get aftermarket ring sets fairly cheap. There are no 3 thou over rings...the 3 thou over pistons use the standard rings.
I have an M18 all in pieces back home...I bought a vertical shaft MV16 very cheap (same jugs, rods, and pistons as M18) and I'll be using them with new standard rings. The crank I'm using was freshly turned before the engine tossed a rod, and it's in good shape. I bought new aftermarket rods for it. Someday, I'll find the time to put it all back together....
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