After removing gas tank, seat, secondary and airbox on my 2012 SBA, and after final assembly and clean up, I found this square nut. It is square and threaded. I have no idea where it could have came from. It may be possible it was allready on my garage floor and got kicked around, maybe from the lawn tractor but I am not sure, it looks kinda old and rusty to be off a 2012......
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