Sounds like you're sorted then. I think the bolt I had made was an M6 thread, or whatever the standard stud nuts are!!
The hex nut was around 20mm I think, and around 15mm was ground away to allow the bolt to slip through the downpipe header flange..
The hex nut was around 20mm I think, and around 15mm was ground away to allow the bolt to slip through the downpipe header flange..