The ACL main bearing set includes a recommendation to use replacement 3M2637A-.50 when original stock is exhausted; it is supplied as an engine crankshaft main bearing set for the supported application. This set restores crankshaft support and proper running clearances during rebuilds, with the listed alternate part number provided for sourcing if needed.
ACL WHEN STOCK EXHAUSTED USE 3M2637A-.50 Engine Crankshaft Main Bearing Set