The Stovebolt Site Forums The Shop Area Engine Shop 52 Chevy 216 main bearing insert identification ?

I have a 52/53 216 that was converted to insert bearings. All the bearings are stamped with "VR" in a circle. The bearing PNs from front to back are: 2455M, 2434M, 2436M and 2438M. The bearings are .020 undersized. I puting a replacement crank in that is .010 unersized, so I'm trying to identify these bearings to cross reference over to a replace, such as Federal Mogul.