There are a bunch of 3D prints for Vixen GP's on thingiverse. I recently had an RA motor cover printed to original specs (well, not green or blue but black ) -
https://www.thingiverse.com/search?q...&sort=relevant
I do have quite a lot of GPDX/GP parts but am reluctant to sell anything whatsoever. I even have a complete SkySensor 2000 in near-new condition (using the Skywatcher GOTO kit for the EQ5 on mine currently). ANYTHING GP is getting exceedingly hard to find.