I am restoring a 1977 Lawnboy 5024, that belonged to my late grandfather, with a D433 engine. The lower bushing is shot and I'm having a hard time finding a new shortblock (681526). I would even settle for a used one. Someone on ebay told me that for this model I could even use the same motor from the 1982 model 5006 that was actually made for the snowblowers, and would actually work out better because it doesnt have the lower bushing instead it has another needle bearing that can be replaced if needed. If anyone can point me in the right direction it would be appreciated. Until then, I'll keep looking!