They are the original bolts. They have a starter thread on them like a fender bolt. I have several in containers from cars not all had the same bolts my 71 has a shoulder at the head but the same length thread . I install the bolts right back in the cross member they came out of. I have cross member bolts nuts and the square washers with the 7/16 factory bolts for the mount itself. I think I have a picture posted here somewhere . You can see all the different cross members hanging up. I also have the factory 5/16 nuts for the mount. I got your pm. 65 to Alabama . Just checked shipping. I have a 71. The one I pictured is a pic I had of one I used to mount this trans and member in my 71 for console location. That's why its on this trans. I just took it out while it was on the bench I bolted several shifter's up to put linkage on for listings. My Pay pal is listed above. leave your shipping address. Steve