Same here.  I found the part number that he listed on my distributor website if I put the number in under parts lookup, but if I try to put it in my cart like I am going to order it, it shows as an invalid part number.  He may of found one of MTD's errors in the part lookup system, or may of been a valid number in the past but is NLA.  I found the part on the Troybilt site like he said but shows it back ordered.