Mitsuzero it seems that (now) none of the auto parts stores stock or sell a vacuum advance control for our distributors..! My memory is shot but I think it was O'Reilly's that sold me a vacuum advance for my 1986 truck a few years ago (my install photos below) I was able to replace the vacuum advance control diaphragm part without having to remove the distributor by using an offset Philips screwdriver...
SUMMIT RACING SELLS IT: https://www.summitracing.com/parts/smp-vc268
Here is a link to the 1987 part that fit my 1986 truck and it might fit the distributor on the 2.0L engine as well... There is a Tel No. at the page bottom to contact Standard Parts Company & hopefully they can source the part...
https://www.standardbrand.com/en/ecatalog?partdetail=VC-268
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