My 1995 Impala SS calls for a PF52. My 2001 Sierra with the 6.0 motor calls for a PF59. Just got a new 2003 Chevrolet SSR with a 5.3 aluminum block, aluminum heads. It calls for PF44. I found some of the "good" UPF Ultraguard Gold filters in the UPF44. Chevrolet dealer thinks he has located some UPF Ultraguard Gold UPF59's. No UPF52's can be found. Are some of these 3 filter #'s interchangeable? Can I run the UPF44's on the Impala(it has the factory LT1 5.7) or the C3 with the 6.0 motor? I like what I read and hear about the UPF filters and would like to run the UPF44(I have a bigger stash of these) on all 3 of these vehicles if possible.