Many places sell poor quality M7 studs but some sell decent quality strong rolled studs. Unfortunately, virtually everyone (even those that sell decent studs) sell them with standard [fairly soft] standard M7 nuts, whereas the orignals were lower than standard profile and really nice and tough, unlike the common ones that can strip pretty easily.
Sadly, the last place that supplied decent new nut (original spec') then supplied me the standard/common type when I ordered more for my stock shelf
As it stands, I don't know who supplies the original spec. Happy hunting, please let us know if you find original spec items?
Adam