Still wonder why AC did not include a coolant recovery tank on all of their models? I found one on ebay ( Arctic Cat 650 V2 4x4 Engine Radiator Overflow Tank #19 2005 | eBay ) that I used on my 700XTX. I keep finding a wet spot under my Prowler after parking it overnight. Replaced the cap, lowered the coolant level but no change. I use the recovery tank with great success! Park it now after a hard ride, and the tank is 3/4 full, check after it has cooled off and the tank is nearly empty! Any coolant recover tank that fits would work, I just used the AC one because of the mounting bracket!