Spacers Specs/Usage Allows efficient mounting of several spacers together to obtain wider bracket or guide rail distance. Usage: Use MP-504- S with MP-503-B bracket. Use MP-511-S with MP-510 bracket. Use MP-221-S with MP-221-12 bracket. Part No. A B C Qty Drawing MP-504-S 3.75 1.90 0.75 MP-511-S 2.95 1.97 0.59 MP-221-S 4.39 2.05 0.59 Download Note: Drawings are in eps (vector) format.