My original blaupunkt worked, but I really wasn't able to tune it, so I purchased the used unit from VSR1.
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Installed with no cutting needed. constant 12v comes from the cigarette lighter with switched power from the original wiring.
I did add the static cling decal that was available at an additional cost from Retrosound and added some different knobs that are more in keeping with the period.
For speakers I used the custom auto sounds "under cover II" speakers and upgraded the in-dash speakers (can't recall the make/part #). There are no speaker holes cut in the car and I decided that I wanted to keep it that way. the speakers in the rear are on the floor and tuck up under the front seats nicely.
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I did pick up a Becker Europa from eBay and have been thinking about sending it converted with the FMR and bluetooth upgrades. Meanwhile, while not stock it looks reasonably close at first glance.