I’ve got a very similar situation.
I put a NAS step on my 90 - and when I test fitted it, it all looked ok.
When I came to fit it though the bars weren’t painted - so I left them off to start with….. and now when I’ve come to fit them I’ve noticed they would need the same twist and also the holes elongating. Looking from the side the NAS step actually sits out a bit at the bottom. It’s not vertical.
I was pondering wether to have a twist put in the brace - but as a first step I thought I’d loosen it all off and see if I can get all the bolts in and then tighten it up and just see how much tension went into it.