I think I have finally found some info on the stock speakers that were in my Peavey 410TX Bass Cab, found this webpage after doing some googling this afternoon:
https://www.hifisoundconnection.com/...EY-PACKAGE-368
Even gives a full list of all the specs of the speakers.
These Eminence Retrobass 10 Inch speakers look like they may be a good substitute/replacement:
https://thespeakerfactory.com.au/pro...=shopify_email
I could even go with these, I'd end up with a 4 Ohm cab if I used four of these in a series-parallel wiring setup:
https://thespeakerfactory.com.au/pro...=shopify_email
My Fender Super Twin will work with a speaker load with a minimum impedance of 4 Ohms, I would then most likely get the maximum power output of the amp if I plugged it into the Peavey 410TX with four of the 4 Ohm Eminence Retrobass speakers in it.