M88a extra parts and mods

Found an M88a at a flea market last year and have been doing research for a while now but for the life of me cannot find any spare parts or modification recommendations. Any help?
 
They aren't common pistols, so there are no real modification recommendations.

They are similar to the other Zastava Tokarevs so you can substitute some of their parts.
 
The only "modifications" I know if involve polishing some of the internal parts that help smooth out the trigger. And as mentioned above, that work was done on either a Tokarev or the M70a.
 
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