Yes, the older parts are getting hard to find.
You should have the Mitsubishi FM145 trans
You may have to make your own bushings or hit a wrecking yard to see if they have an older trans and will part with the bushings.
Not sure if the M5OD had the same size bushing or if it can be modified to fit.
Here is the how to on those: TRS Magazine - Shifter Bushing Replacement