Did LA water pumps ever get fine thread bolts from the factory?

One of our friends in the business, caught a shipment of LA water pumps, with fine thread 5/16 - 24 fan / pulley bolts, vs 5/16 course. Was this ever a factory thing? OR just a shipment of mis tapped water pumps?

I hadn't heard of it, but figured you guys would know!!

Luckily they weren't our pumps. Lol

I found this old thread...but nothing difinitive.

La fan blade bolt threads fine???