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OK, it took me a while to get around to this but here are some pictures and numbers for the Jahns pistons I have :
Pin diameter : 1.000", pin tapers inward on the inside.
Compression height : 1.510" as measured with my Mitutoyo 6" caliper. 1.510" NOT 1.501".
Ring grooves : 5/64" / 5/64" / 3/16"
Pin bores are grooved for the spirolocks and the one piston I unwrapped for the pictures weighs 745g according to my super high-tech scientific Wal-Mart digital kitchen scale :)
The gap where the small end of the rod goes is 1.368" wide if that matters.....
The IMPORTANT envelope has some general information as far as fit is concerned but no technical details about these specific pistons.
Again, any insight or knowledge about these would be greatly appreciated !