This listing is for a running board, MTD part #177706.  It was removed from a MTD Yard Machines 16hp 42 inch lawn tractor with a model 42A707-1238-01 16hp Briggs and Stratton vertical shaft engine.  The tractor pictured in the listing is the one this part was removed from.  If you are not sure if this part will fit on your tractor, then please ask.  It is in good condition.  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!