The Oem bolt for the alt is too long if I rotated it.. The oem bolt for the TGVs are too short with the Grimmspeed 8mm spacer. it came with longer ones. So I used the OEM TGV bolt for the alt and it was a perfect fit.. I have a small belt I use 33.5 inch belt it works and with modification to the post for the power line for the alt it worked perfectly.