I have a 2008 Joyner Renegade R2 and have a couple of parts that I have found that work. Maybe they could be put on the list for replacement parts.
Front wheel bearing kit is a Moose Racing through a parts unlimited dealer 0215-0076 retail 32.95 fits Artic Cat but I have used these in my Renegade comes with bearing and seals for 1 wheel.
Differential axle seal 35x55x8 double lip found on ebay 10 for $35
Oil filter Fram ph3593a
If anyone needs a new alternator but dont want to pay $180 for a Joyner brand. I used 14971 $100 from autozone and fabricated a braket from some old joyner brake pads and a longer belt 4pk0800. Works good. It has a 3 wire plug but just used the 2 wires from original with spade connectors.
I also have some Can-am commander lower ball joints on order. They measured close on the vehicle but I will get back to you on that.
The spark plugs are the same as trooper I used the NGK iridium plugs but don't have that written down.