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I was that guy Kurt mentioned that had my top done last December. I dropped it off at a shop that supposedly did many Porsches and fabricated their own tops for them using all original materials. I expected to pick it up the next day, only to go not get it back for a month and a half. The problem is that the rear window kept having a big loose wrinkle at the sides of the plastic rear window which the could not get out no matter how they pulled it. I have a '84 and they maintain that the 83-84 cars are slightly different from the later frames. However GAHH, a large manufacturer of convertible tops disagrees. I have seen a GAHH top on an 83 and there were no wrinkles in the rear window, however, they only make one style - narrow - window, and the bottom edge of the canvas where the front half meets the rear half did not line up perfectly, by 3/8 of an inch. Robbin's Auto Tops also does not seem to be aware of any frame differences, however they acknowledged that back when they did installations, they on occasion did some unethical hack and restitch techniques to get a top to fit.
The shop that did mine, took so long, because they went through four iterations of top patterns until they got it right. It was the shop owner's personal challenge to figure out what the problem was, and create the master pattern for all future cars like mine. Nice guy - their shop supposedly does the custom upolstery work for Gemballa too.
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