Dang now I'm second guessing my M8 x 1.25 die wouldn't thread on to a strut stud when I tried it about 2 years ago
I'm sure you're good either way.
You just thread your 1.25 die on to the strut studs, then buy M8 x1.25 nuts to fit.
(not much meat left to grab on to after all the cross-theading though. Lol)