Get to the unit information screen of the Monster then hit "I" (Yes capital I, it won't take lower case i) and it will display the Unit number as well as current equipment (weapon and armor) numbers.
Also Edi has compiled a DB I believe with all the numbers, it's around somewhere try looking on Arryn's Site as it's usually hyper-up-to-date.
Thanks for the quick answer! That's just what I was looking for. One small, problem, though ... the modding I want to do seems to trigger the cheating protection. Now I play purely Single Player. Don't get into MP at all. Is there no way to disable the cheat protection so that I can create and play my Pretenders exactly as I wish?
Ah, so *that* was the condition. I knew there must be some way to use modded pretenders in multiplay, but as I have never had to find out how it works I just solved it by disabling cheat prot for my singleplayer games.