This listing is for a pair of rocker arms and adjusters, Briggs and Stratton part #691751 and 691986.  They were removed from a MTD Huskee 16.5hp 42 inch cut lawn tractor, model #13AN673G131 with a OHV Briggs and Stratton model #313777-0163-E5 engine.  They are in nice condition.  Please confirm that these parts will fit your mower before purchase.  Payment within 2 days of purchase.  If you are looking for a part that I don't have listed please ask, I might have one.  Thanks for looking!