Gosh now you have me wondering if mine fits as well as I think it does. I slipped mine on, no problems, it cleared the engine. The only thing I did to add stability was remove that wire deal in front and ran a short aluminum "bar" from the "wire" holes to the old wing mounts (welded to the front frame brace). Put rubber gromets in so there's still a little give. I also covered the under-side of the tank with that metal heat reflecting (rubberized) tape stuff. Copied the stock tank graphics using black number background sheets, a generic XR decal, and it now looks like an oversize stock tank.
Bottom line is the tank is, IMO, great, although I haven't tried others. Based the decision on these forums which suggested it was a good option.
Sorry to hear your problem and the IMS
may be a good alternate, again according to forum info.
The main problem with Clarke according to some is the stopcock fitment (hard to get stock valve into the new bracket). But all you do is just loosen the factory delivered bracket, insert the stock valve/filter/stem retighten and magicaboola, yer done. Took me an hour to mount and another hour to fabricate the aluminum (non-factory) braces.