Ensure you have 14x1 RH, not LH thread like AK -- some variance in early Vz2008s.
If so,
SF Brakes are likely going to be second-hand moving forward.
Zendl makes left and right hand comps and best option there, and some US sellers, at least occasionally.
Polenar has a variety of Vz58 brakes available, and I think they ship to US.
There are other Czech options, but more difficult to acquire.
The vortex flash hider is also solid -- make sure you get the non-extended version though if buying from Czechpoint.