Early-A Convertible Chassis Reinforcement

Here's a link for the US Car Tool ones. https://store.uscartool.com/63-66-Mopar-A-Body-Frame-Connectors_p_41.html

They are the coolest ones and I would guess strong and light weight.

Here's a FABO link for connectors that one of our members makes. They are very nice and many have used them.
http://www.forabodiesonly.com/mopar/showthread.php?t=124360&highlight=subframe+connectors


Hope this helps, toolmanmike