Thanks to you both for your responses!

So, I did some looking around.

Notfuzzywarm, do you think this might do the job if I can't get a hold of one of the actual AUC adapters?

https://www.amazon.com/All-UART-Serial-Adapter-Converters/dp/B0723BDXGR/

This is the only one I've seen that:

1. looks correct
2. doesn't require further wire connecting/soldering on my part.

Thanks again.