I guess yours has a different one listed because it's a 2019. My 2020 manual never mentions pf63e for v6 or any motor.The manual I downloaded from My Chevrolet says it should be an AC Delco PF63e (GM Part# 19330000). This is for the v6.
When I looked up UPF63r on Amazon, it said it does not fit my v6 Blazer. But the again it also said the PF63e didn’t fit ?