I don't have stock at this very moment, but I should have some by the end of the week at the latest.
Unfortunately I don't send the bolts with them and I don't have a way to measure them anymore as I've had to sell my Mu
In regards to the egt probe being welded into it; when you purchase an egt gauge, it will come with a little internally threaded grommet which you can weld into a section of your exhaust to accommodate the egt probe. You would have to take the grommet and the blanking plate to someone with a bench drill and a welder and get them to knock it up for you.
I could do it for you if you were to send the grommet to me, but you'd just be waiting longer for your products.
Edited - so many spelling mistakes. Never again do I post with my iPhone.