I agree, attach a necklace chain to the old rim and sell it as 'BLING', then buy a used one for cheap !

I don't think those modern reductionist spare tires will work on your car.

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD