REPLACES OEM:Murray: 55323MA,Simplicity: 55323MA,FITS MODELS:Murray: 20" and 21" single stage snowblowersSimplicity: 521E single stage snowblowersSPECS:Width: 1 1/2"Length: 20 9/16"Thickness: 1/4"Center To Center: 6 1/4"No. Of Positions: 4Material: Black Plastic