I have a Standard size 3.000" Routts big bore 750 and am looking for Routts pistons. The existing pistons got damaged and I need replacements, my pistons have "TRW Routts 40399" id on the inside. Both my cylinders are still in pretty good shape and measure 3.002 1inch from the top and 3.001 inch up from the skirt. From the fact sheet on Routts, the piston clearance for a 9.5:1 forged pistons is .004 to .0045. I am hoping I can get replacement pistons that will fit, any one now if you can actually get Routts pistons for standard? If not, I am looking a MAP pistons for Standard. Is .002 wear acceptable?