Product review (5 stars): Another fix to the wheels coming off
I've bought several of these OEM assemblies as the axles wear out and the wheels come off. All I needed to replace was the axle, not the entire assembly. I found that a 1.5" 5/16" carriage bolt, washer, and lock-nut  (all stainless steel) make a permanent replacement for a fraction of the cost. The smooth head on the bolt fits perfectly in the hub of the wheel.