After going down the rabbit-hole of the service manual (and a ridiculous amount of Google), I think I found the part number for the cable. If that says "Type B-1" on the cap, then the part number is probably 96476972. Make sure you are sitting down when you look at pricing...

Found it after cross referencing the engine block heater part number (96898044) on this site:
https://nemigaparts.com/cat_spares/e...t/01/dt01-312/

As a caveat, I have the manual for an 09 Aveo5 LT, but the engine should be the same between both model years (and the accessories as a result).