I read some good information on Shear Bolts on the forum. My used (new to me) L5030 Kubota and Pronovost Snowblower are receiving some needed maintenance. The Pronovost is a Puma 74 model and lists the shear bolt as "Shear bolt 5/16" NC x 1" lg grade 2 + nylon locknut". Does anyone know of a source to purchase this item? It does not have a part number in the parts list.