The 54416730 by Ingersoll Rand is the back beltguard assembly used on the SS5L5 air compressor. The back portion is considered the part of the beltguard which includes slots for the crankshaft and motor pulley. This section screws directly onto the compressor topplate and is technically closest to the motor/pump.
Part #: 20100277
Part #: 20100285
Part #: 23474661
Part #: 95099453
Part #: 97339246
Part #: 54416748