PISTON KIT 98-01 YFM600 96.00, NAMURA NA-40007-4

Part no 56-W4797+100.NT (phoenixmotos.com)
Yamaha ATV YFM600 Grizzly 1998 - 1901,
YAMAHA XTZ600, XT600, XT600E, TT600, TT600R, SRX600 1984 - 2004,
Namura 96.00mm piston kit (Namura part NA-40007-4)