I restored a 64 4000 diesel industrial a few years ago with the SOS transmission. New torque limiting clutch plate. Was not long before the rivets sheared out and had a little elongation in the holes. I ordered the next diameter Hi-lok that was compatible with the new holes. The holes were reamed to a close tolerance fit for the fasteners in the hub and the plate. Fastners were cooled in dry ice and installed. In the last two years have had no problem but the tractor is not used that much. Click on the link for the Hi-loks.