Response to Hi, Jerry. The B2853 or PL2853 motors can be used to replace motor one with Part # 7-177474-01 and the B2748 will replace the second motor wit with CAT # B2748 / Part # 0-196269-20.  You will also need to get the Whisperflo Tune Up Kit - GOKIT32 or GOKIT32SALT

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