Those porcelain fuses are not unique to the Pantera. They are fairly common on other cars built in mainland Europe in the '70s (e.g. Opel).
I found some in the UK from tractor parts supplier, 30 fuses for 4 dollars.
Try your local VW dealer - I think 60s and 70s beetles and mini-bus/camper vans have the same fuses.
Found these on eBay advertised as 'for beetle'
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