taurus would pretty much be the sole source for spare parts. im not sure if the grip screw holes are the same as a 1911. if not again taurus would be pretty much it less you were able to find something on hogue's page.
for compensators i would check out clark customs. i believe they have one for the pt 1911 in 9mm. contact info:
Clark Custom Guns, Inc. Home Page
336 Shootout Lane
Princeton, LA 71067
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