Remanufactured Bendix Compressor. Caterpillar - Flange Mount Competitive (Remanufactured) Bendix BA921. BA921 Flange Mount - Caterpillar C11, C13 Engines, Engine Drive, Includes installation gaskets and O-rings. 42 tooth, with oil pump, external oil return Product Features:Remanufactured parts are completely disassembled and wearable parts replaced providing longer life than rebuilt partsISO 9001 and MERA member certifying repeatable processesRemanufactured in the USA