u/Large-Bonus3043

i just had my z (03 touring 6spd) in the shop to get all three position sensors changed. that would be camshaft bank A and B, as well as the crankshaft sensor. what's odd is when i picked it up he told me he only changed 2 sensors because he "couldn't find a crankshaft slot in the center" and that the only part that fit in one of the camshaft slots WAS the crankshaft sensor he ordered. and the even weirder part is that the car drove home perfectly fine with no issues, codes, or sputters. can someone explain to me where the sensors are located and how they differ from eachother so i can make sense of this? either i read something wrong online or my car is somehow driving with mismatched sensors and possibly one missing entirely?? maybe i understood the mechanic incorrectly but any help is appreciated. thanks.

tldr: need explanation on cam/crankshaft position sensors and where they go