Just discovered this older post on Wiper Motors and thought I'd add my info. Hadn't realized wiper motors were date code until just recently. I'm the 2nd owner of this '69 Z28 and bought it from my best friend's older brother in 1979. I helped him get prices on the car from several Detroit area dealers on his behalf, but he ordered from Snyder Chevrolet in Defiance, OH. It was delivered to him on 6/9/69. The car had 5,172 at the time I bought it from him and it had not been licensed since 1973. I've been very familiar with this car since before Day 1. Given all this, I'm as sure as anyone can be that this is the original wiper motor that's still on the car today.
I am not sure how this new data gets added to the wiper motor date code chart Kurt has uploaded. Perhaps someone can do that?
Body Build Week: 05E
Assy Plant: NOR
Vehicle Type: Non-RS
Sticker p/n 5045572
Stamped p/n: Yes, also 5045572
Sticker codes: 106 9 B F
Wiper Plant: Rochester