My father in law now deceased bought me a sears craftsman 42 inch riding mower about a year before he died of kidney failure, so the mower has sentimental value, well the part where the left hand blade secures to is a nub and I was told by sears they no longer carry that model number deck. Are there any other decks out there that are compatible to my sears 42 inch model number 917.287030 mower?