So I bought a 97 Blazer(4 door, 4wd) used and it didn't have a keyless entry remote. I called some dealerships for a new one and their charging about 100 bucks. Anyway, I was looking around on Ebay trying to find a used one. I kept comming up with some differnt part numbers.

GM: 16245100-29
GM: 16207901-5

but the dealership said it had to be
GM: 122451-50

Will the two previous work or will I have to get it from the dealership.

u need to see if you have (AU0)
and if you dont. your vehicle doesnt have remote transmitter
pn is 16245105.
gm doesnt use (-)