When I bought my Carrera 3.0 in 76 it came with 7&8x15 Fuchs rims. At tire replacement time I bought 205/50x15 for the front. They worked great. The same will be true of your 73. The back I really couldn't say except that at one time I also has a 72 with 7x15 and 215/60x15 which just barely rubbed ~5" up into the paint on the rear 1/4 panel. Don't hold me to closely to that last # it was a long time ago.
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