I just ran across this new repop connector. First time I seen it available.

Dash Astro Vent Accordion Connector-Firebird Central

Firebird Firewall Astro Vent Duct Connector, 1968 Ecklers

Glad to see they are being made.
Mine were missing and I had to look pretty hard to find a set.

I just installed mine today and they worked great.

I wish I'd seen this before I spent $100 on a pair of old used pos.