Edit: I think I have located a set. Thanks to everybody who offered up wheels.
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I'm looking to buy a pair of nice steel 914 15" wheels, the earlier style that takes hub caps. They'll be going on my '73 1.7.
I want to strip and repaint the wheels on my car, but don't want to take it out of service while I do that. So, the plan is to buy a couple of spare wheels, re-do those and then cycle through my wheels a pair at a time until they're all done.