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I could be wrong here, but I have searched and searched for a short shift kit for the G50 and to the best of my knowledge they do not make one. my understanding is that the G50 came w/ a substantially shorter shift than the 915 cars already from the factory. But I have no idea why any aftermarket company doesn't make one. Or @ least I cannot find one.
I don't think there is an aftermarket offering, but my '88 Commemorative Edition has a factory short shift kit...so there should be at least one option available for you.
My 88 Carrera came with a factory short shift. I think it was option 243. Call your nearest Porsche dealer to see if they can get it for you. I don't know of any after market producer of them..