Socket bases for the front turn signal assembly

I'm looking for socket bases for the front turn signal assembly. The part number is 10-32-17b. I would like to purchase two. The regular parts suppliers are out of stock. I've seen some very old postings on the forum that list replacements, and am trying to contact the posters. Any suggestions on NOS, used, reproduction, or replacements?

One additional thought - Amphicar likely sourced many parts from other suppliers who used these in other cars. Any ideas on this part? (As Amphicar parts become more scarce, perhaps we should develop an 'interchangeable' list.)

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