Fits these machines
621, 621B, 621R, 623, 623B, 627, 627B, 631C, 631D, 633C, 633D, 637, 637D, 639D, 641B, 650B, 651B, 657, 657B, 660B, 666B, 768C, 769C, 772B, 773B, 776, 777
Compatibility has not been verified by Seller. Buyer is responsible for confirming fit.
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