5151 Stop Arm Microfit Retrofit Kit $165.69 Quantity discounts available QuantityPrice Quantity -+ Add to Cart Details replaces old style microswitches and relays that were prone to freezingused in stop arms onlysee 5155 for crossing arm kit7 wi... Details Back Detailsreplaces old style microswitches and relays that were prone to freezingused in stop arms onlysee 5155 for crossing arm kit7 wire