PLC 5 Wiring Arms

Need to add some ac I/O to an existing PLC 5 conveyor system and we are shopping on eBay for parts. Our ac input and output modules came in today but they don't have wiring arms.

I am finding a lot of wiring arms on eBay but don't see any differences in them? Are all the wiring arms the same for all the I/O cards?

What I found with the 16 channel wiring arms was that the terminal numbers are embossed on the arm, so if you were to look closely enough they may be incorrect between digital and analog cards.

In theory they are 21 terminals marked 1-21 or ABCD 1-16 Com

what cards? plc5 had a ton of different wiring arm configurations.