A and -B are the same as standard part numbers, but in smaller quantities.
-L parts are initially placed on the reel. -L indicates that these parts have been cut from the reel and are in small quantity.
-MR Parts are placed on mini spool. They are the same as standard part numbers, with the difference being that each reel has a smaller number.
The -C part is a mini Gaylord for the conduit, the same as the standard part number, only shorter in length. These -C items can be shipped in small packages such as UPS or FedEx.