I found some more info, thoughts?
Stihl 066 660 54mm
Piston Pin 12mm x 8mm x 33mm
Pin top to top of Piston 17mm
Height 43mm
Stihl 046 460 Big Bore 54mm
Piston Pin 12mm x 7mm x 35mm
Pin to top of Piston 15.5mm
Height 36.5mm
Stihl 066 660 54mm
Piston Pin 12mm x 8mm x 33mm
Pin top to top of Piston 17mm
Height 43mm
Stihl 046 460 Big Bore 54mm
Piston Pin 12mm x 7mm x 35mm
Pin to top of Piston 15.5mm
Height 36.5mm