ProX Piston Kit RM250 00 02 (66.34mm) Boots 350 500RR 19 23 SS '051201 350 500RR 19 23 EXC 300 93 03 DF606 DF607 KTM 300 XC W 300 06 DF606 DF607 KTM 350 ENDURO 350 88 DF607 KTM 350 EXC F 350 12 23 DF606 DF607 KTM 350 LC4 EXC 350 94 DF606 DF607 KTM 350 MX 350 91 91 DF607 KTM 350 MX 350 92 DF606 DF607 KTM 350 SX F 350 11 23 DF606 DF607 KTM 350 SX FACTORY 350 10 DF606 DF607 KTM 350 WMX 350 88 DF607 KTM 350 XC F 350 11 DF606 DF607 KTM 400 EXC 400 04 DF606 DF607 KTM 400 LC4 EGS 400 94 95 DF606 DF607 KTM 440 SX 440 94 DF606 DF607 KTM 450 EXC 450 03 03 DF606 DF607 KTM 450 EXC 450 04 DF606 DF607 KTM 450 EXC F SIX DAYS 450 17 23 DF606 DF607 KTM 450 EXC R 450 08 DF606 DF607 KTM 450 MXC 450 04 DF606 DF607 KTM 450 RALLY FACTORY REPLICA 450 19 22 DF672 DF607 KTM 450 RALLY REPLICA 450 23 23 DF672 DF607 KTM 450 SMR 450 07 20 DF672 DF607 KTM 450 SX 450 03 DF606 DF607 KTM 450 SXF 450 07 23 DF606 DF607 KTM 450 SXF FACTORY 450 18 23 DF607 KTM 450 XC 450 06 DF606 DF607 KTM 450 XC SIX DAYS 450 10 DF606 DF607 KTM 500 EXC 500 14 DF606 DF607 KTM 500 EXC F SIX DAYS 500 17 23 DF606 DF607 KTM 500 GS 500 89 DF607 KTM 500 MX 500 89 91 DF607 KTM 500 MX 500 92 DF606 DF607 KTM 500 SX 500 93 DF606 DF607 KTM 500 WMX 500 88 DF607 KTM 505 SX 505 07 DF606 DF607 KTM 525 EXC 525 03 03 DF606 DF607 KTM 525 EXC 525 04 DF606 DF607 KTM 525 MXC 525 04 DF606 DF607 KTM 525 SX 525 03 03 DF606 DF607 KTM 525 SX 525 04 DF606 DF607 KTM 530 EXC R 530 08 DF606 DF607 KTM 530 XC W 530 08 DF606 DF607 KTM 530 XC SIX DAYS 530 10 DF606 DF607 KTM 540 SXC 540 99 DF606 DF607 KTM 550 MG The black coating is made from a delicate mix of materials and will increase performance Most of the ProX pistons come with a coating