My Meteor MS440 pistons came in today, and I compared one of them to a OEM 044 12 mm piston if anyone is interested.
The OEM piston w/rings and wrist pin is 3.3oz, the Meteor is 3.4 oz. Both wrist pins are the same size and were 0.5 oz.
The OEM piston had straight skirts, the Meteor has wings (stabilizers), which I prefer, but they make it harder to get an accurate measurement, but I did the best I could.
Both pistons have the same total height - 1.555 and the same width at the bottom of the skirt - 1.966, so my OEM piston is still good!
OEM Ex skirt is 1.342 wide, Meteor is 1.351 (measured under the wing).
OEM intake skirt is 1.338, Meteor is 1.345 (measured above the wing).
I plan to use the Meteor slug with a OEM 440 jug on an Asian frame and see how well I can get it to run.