If you aren't ordering everything from RMATV through Caleb you are wasting a lot of money. Really, I can't say enough good stuff about how much money Caleb has saved me and how fast he is at getting stuff ordered.
Thanks, I do my best but sometimes I get swamped at my job that actually pays me and I'm a little slow to respond
FWIW, I can get the IMS tank for your bike from RMATV. Their price is $247.99, my cost on it is $211.72 to your door. That includes shipping, fees, etc. I can get about the same kind of discount on the Clarkes, but as you know, they don't carry one for your year. If the newer one will fit, I'd be happy to price that for you. I know it's quite common for the yamahas to have to do some swapping for the tanks, such as certain year WR450s require you to use YZ plastics with some of the aftermarket tanks (I think it's with the IMS tank). Or the Clarke for the WR450 requires you to flip your fuel petcock around so it's backwards.
After having installed both Clarkes and IMS tanks, I would pay the little extra for the IMS, but that's just me. The IMS is also slightly larger (3.6 vs. 3.1).