C-C distance betw. M8 bolts/bolt holes for passenger peg/muffler brackets RD350A

[Dvsrd]

I have not planned very well, as I am now at work, with access to milling machine, lathe , welders etc. But forgot to take a simple measurement before leaving home  :embarrassed:

C-C distance between the M8 bolts/ bolt holes for passenger peg/ muffler hanger brackets on my 74 RD350A.  (My memory is unfortunately not as trustworthy as it used to be....)
So if someone could get me that measurement, it would be great!