Hello highboy_34,
Since the sleds are old, parts are getting harder to come by. This site is probably the best place to track them down. You can keep an eye on our classified section, there are a lot of us keeping an eye out for parts and posting links. ebay has a lot of stuff, so if you're a member, you can save a search and have notifications emailed to you every day, like I do. Use search terms like vmax-4, vmax4, vx750, etc. If you're looking for something specific, post in the "wanted or trades" section. PSI pipes are hard to come by, and there are several members looking for them, so you have to be quick!
Mark