Another source is the Facebook group Mitsubishi Monteros USA Exchange page. 7k members, with a few who have side hustles of getting parts for people. Christopher Leon and Owen Montero come to mind. And yes the axles have to come out to get the backing plates off. Hopefully amayama hooks you up, if not, there's an option for you..

MMUSAE
https://www.facebook.com/groups/1507345922865639/


89 SWB, V-6 5SPD, OME Shocks, 16.5X37's, 2"BL, SR axle, Gen2 brakes, Lincoln w/Superwinch