try somewhere that has the oem parts finder.
I know www.albaaction.com has the parts finder program, or any good parts dealer should. If it's just a o-ring you may also be able to find a suitable replacement somewhere that sales hydraulic supplies.
2008 LTR450
Trinity intake kit; EHS prefilter lid
Dasa Pipe; PC III
Pro-Armor Skids, Nerfs, Chain Guard,
Shift & Brake Lever
Pro-Designs Case Saver
CF Frame and Pump Guards
FUEL anti-vibe Stem
Fasst Flexx 14* quadracer bend
2001 Warrior
DG Xcellerator III
Pro-Flow with K&N; No lid
AC Skids and Bumper
WB Nerfs
Razr 2 all around