Is there any difference in the M23 cradle mounts for a 50 cal...I found 2, one says its for an M66 ring mount and the other one says LMTV, 923, etc. I don't see any difference in them. The ring mount looks to be in better shape is why I'm asking. I need one that I can use for a pedestal mount. Also what is the correct size of the "socket" on the top of the pedestal that the cradle mounts into? I've only found one and it says it's used for M25, M31, etc. and accepts standard USGI cradles, so is the M23 cradle , a standard USGI cradle.