I'm pretty sure ( not 100%) the RT180s used the same engine as the monoshock DT175s, they should swap straight across. MX175s with oil injection and monoshock should work, too. IT models were different but might not be a hard swap if you're up for some fabrication. Good luck!
P.S. I have been told that slightly bent forks can be straightened in a press, but that it's not safe to straighten them more than once. This advice was from the service manager at a local shop.