On this side of the Pond, I'd try Wilkinson first. These units were used on many more cars than just our Panteras. I have seen them several times on overseas eBay auctions, but a quick search today failed to locate any current offerings.
I'm not sure how important to you it is to have an authentic Carello unit? A similar 'tag on' light was used on the European Fords for many years, it's an Altissimo unit. There's a couple on Ebay UK right now, maybe one will do until you come across an OEM Pantera.
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