From what I understand, 4wd tanks will fit okay on 2wd's but 2wd tanks don't fit well on 4wds. The 4wd tank has a relieved area formed into it so it won't interfere with the transfer case. Since the 2wd tanks are not relieved, there will likely be an interference issue if you put one on a 4wd. Since you got it up there, I'd take a good look to see where (if anywhere) it's hitting. Depending on the spot you might be able to mark it, take it back down, and strategically put a dent in it???
The Toyota part number for the tank you need is 77001-28300. If it's available, it's MSRP is around $600, but a brief search revealed it may be available on some discount sites for as low as $430 (which to me means NLA). Tanks can get pretty nasty inside, but IMO they can be cleaned and put back into service. Take a look at the one on page 2 of this thread. After cleaning I have put about 25k miles on it. If you go this route, I would also recommend an aftermarket filter set-up like I documented here on this thread.
There's also products like
POR-15 that can work well in some instances. I've used this on old tractors with small simple tanks (with good results), but never on larger modern tanks with baffles, flappers and/or hard to reach areas..........not sure I would recommend that here. Tim