Here is a better picture of the private label roller lifters. I've used a couple sets of these now in un-bushed, production blocks. They work great with no oil pressure issues.

These are the only lifters that I know of that oil the roller, oil the pushrod, has an offset intake cup and works in an unbushed block. I've talked to Crower, Crane, Isky, Comp, etc and as far as I can tell, nobody else makes a drop in lifter that has all of these features. If anyone has an actual part number from anyone else that has all of these features I'd love to hear about it.