I bought the conversion kit from inline tube. It includes a lot but not those particular bolts- My uncle said he would get the right bolts for his next visit when we start the reassembly, but I will check the forum again periodically to make sure I get the right ones. Brett, the Grade 8 fine thread sounds good, the shoulder bolt seems right too, I searched for a while and didn't find any online but I think that is the right track. Pci, let me know what you find out