2004 Polaris Pro X Factory Service Manual, Page 175Get this manual
FRONT SUSPENSION IFS Shock Production Specifications
550 PRO Arvin IFS Shock PN 7042183
Rebound Stack .800 .008 .900 .008 1.00 .010 1.10 .010 1.25 .010 Piston Orifice .093" Compression Stack 1.30 .006 1.10 .006 .900 .008 1.25 .008 1.00 .008 .900 .008 .800 .010 Specifications 6.27" 200psi 18.00" 6.27" 1700189 170cc 2.50"