I’m not sure, at Home Depot the stud threaded what I mentioned. I found it on RealOEM, part 07129904544 which says M6X30. I didn’t try 1.5, just 1.0. I don’t know if there was a 1.5 thread tester at Home Depot, just 1.0

Also, would I need to cut the head off the bolt to have the threads reversed? Like the threads on the engine are reversed. So maybe the problem I had earlier is the thread direction.