I am at a point where the tank on the 72 is ready to install. but I dont like it. the only year that used this small can located in the rear wheelwell and connected via hoses to the four corners of the tank. its the venting system I guess. I know they used a internal one after this, my question is is a replacement tank my best option for the $$$ or would a poly tank be better? I found one in the old JCWhitney for about $100 and wondered if this would be good. any comments?