Just finished putting one in my GU. It was a LRA in good nick, but it was a petrol and the previous owner letit dry out. So plenty of rust scale.
Fits good, but none of the mounting points match up. The from of the tank requires you to drill holes into the round bar that the old tank was bolted to. No biggie, drilled two holes big enough for two nuts to be welded in. The rear, well that required a couple of mounts to be made, and I welded em to the chassis.
If your handy on the tools, they're good. If not, get a GU tank.