I had a failed tuner on my '83 Roadstar II, and the other 3 are a bit rough, I fear they may be getting close to the end too.
After much digging around, I ordered a set of the Hipshot 20655SK Ultralite 1-2 Short Y Key tuning machines, they have 'blems' available on ebay for about $100 for the set, no blemishes that I can see. The bushing part that goes into the headstock is exactly the same as the stock one as best I can tell. The set screw is not quite exactly lined up with one of the existing set screw holes, but close enough that the set screw goes in just fine, and the tuner body covers/hides the 2nd stock screw hole. This seems to be a very good replacement, and the only option I have found that doesn't require any modifications to the bass.
After much digging around, I ordered a set of the Hipshot 20655SK Ultralite 1-2 Short Y Key tuning machines, they have 'blems' available on ebay for about $100 for the set, no blemishes that I can see. The bushing part that goes into the headstock is exactly the same as the stock one as best I can tell. The set screw is not quite exactly lined up with one of the existing set screw holes, but close enough that the set screw goes in just fine, and the tuner body covers/hides the 2nd stock screw hole. This seems to be a very good replacement, and the only option I have found that doesn't require any modifications to the bass.