I've never seen power locks on a first gen (or second gen for that matter) but the doors on my 88 and 92 had speaker cutouts. The 92 actually had speakers but I don't like my ankle hearing anything loud...I just saw on LMC that power door locks were an option in 91-92...can't remember ever seeing them in Canada...
Any doors from 83 to 92 will fit...extended or regular cab are the same...just pull the door panel off if you are not sure...
I will warn you though...the door hardware for locking and opening changed sometime between 88 and 92...so if you have the hardware that's great...it can actually be swapped over...but not easily unless you are more mechanically adept than I am...which wouldn't take too much...
Check LMC if you can't find what you want...their prices are not too bad for the US...
http://www.lmctruck.com/icatalog/fr/full.aspx?Page=17
Does NOT show a full door as an option here...I asked at my local parts store in Canada and they could get them...