Googled that and it was apparently equipped in the rare C50 diesel as well:
From Germany:
Mitsubishi Colt C50 Lim3 C50 Lim3 1.8l (1779ccm) 08.86-06.92 44KW/60PS 4D65 Diesel
Found one in Sweden?, in a Galant:
https://www.allabildelar.se/lagernummer/HB514496
Page 666 of 1272 in the 89-93CM.PDF file located here:
http://www.lilevo.com/mirage/89-93%20Mi ... 9-93CM.PDF
KM206 F5M22 or F5M31 in non-turbo cars.
Your best upgrade will be to use an F5M33 from a FWD Talon/Eclipse/Laser from 90-92.5 with the 25 spline axle count if that is the axle spline count your trans has now. KM210/F5M31 is what the 2.4L Sonata's used a long time ago ... early 90's, and what the Mitsu Mirage turbo/Colt turbo used as well. If you upgrade to a larger clutch, IE FWD DSM and re-use your starter plate and starter, that will get you a 225mm clutch plate and flywheel. The flywheel stays the same, just that you use more of it. This works for Mirage/Colts, but would have to confirm 100% that it will work in a Galant.