Old Part Numbers: L55Wingnut for old style air filter.

SCREW,CAP,HEX HD,GR5,ST,BLK

Old Part Numbers: EQ38For High Pressure piston.

Old Part Numbers: L21WThis is the one with the EQ38 bronze bushing insert. You need 3 L21L connecting rods and one of these to replace all 4 connecting rods. Order wrist & roll pin also if needed. Works with old style (non-bearing) and new style.