hyd. roller lifter ?

[cldturbo]

Hey guys, I'm trying to find hydraulic roller lifters for my motor. It is a 4.1 production block and I have a billet roller cam, but the machine shop that assembled the motor put the wrong lifters in. They installed some for a 4.3 chevy motor. The shop is out of business now (for obvious reasons) and I'm stuck fixing their mistakes. Any help appreciated.
part #'s please.

Thanks

 

[Trbobuick]

chevy small block retro fit lifters....... comp 853-12 i believe