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PISTON ASSEMBLY, .040, ARIEL KG, KH, KHA, SPLIT SKIRT, 1948-57

Part Number 441-10930/040

Inside raised casting on both:
HEPLEX
10930

Note: One side with what looks like a “3” 57 other what looks like a “R” 58

Also on both:
3447 AM413
PAT No 616820

6.8:1 COMPRESSION