The standard size pistons are color-coded green on the dome.

There are three sizes of the standard piston, color coded red, blue and yellow.
Piston diameter:
Red: 90.167-90.180mm (3.5499-3.5504 inch)
Blue: 90.180-90.193mm (3.5504-3.5509 inch)
Yellow: 90.193-90.206mm (3.5509-3.5514 inch)

Owner caption January 2005 · Photo 99 of 980