Need advice! 900s (93') B202 crankshaft pulley replacement

Hi, fairly new here

I bought a second hand 900s last year around may with a tuned turbo and some broken pieces.
the car generally works well but the alternator drive belts have been a constant headache since I bought the car.
after trial and errors, me and the mechanics I know determined that the problem is from a bad crankshaft pulley.
problem is that, c900 parts aren't that easily for me to get my hands on in taiwan, especially parts like these
anyone got similar issue and/or can give advice?

thanks in advance.