I'm trying to make a couple changes to my V drive and having issues finding / choosing bearings for it. They are pretty common but for some reason the letters that follow the part number can only be figured out by someone smarter then me. 2 are 5308CF and 2 are 5308A. Looking for a chart or something that will tell me what the (and others) letters mean after the part number. There is a ton of the 5308's on ebay but almost none that have my letters.