I have just read Jonathan’s post on Bluster and see the preference for A2/A4 Stainless. I am tempted, but believe there is a different hardness/frailty. I don’t expect these bolts to suffer fatigue and the idea of shiney bolts with neoprene locking nuts sounds, well ‘shiney’.
My taste to replace with good galvanised bolts is more sticking to what it was/is. After all the fittings are still galvanised.