OK, its certainly side mounted towards the top. Theres no indication of any major modifications to the tank. If it was an xj tank and I got a replacement mj sending unit thats supposed to be in there, that would not work? From reading other posts and because It looks like a slightly different shape, it sounds like it could be modified but instead of getting to that, I'm wondering if theres any exterior indicators of what the tank is, I can't seem to find any.