I wondered the same thing. I was thinking of going a size smaller and using a brass bushing.I never understood why it needed shoulder bolts. I used a normal bolt. I actually resized the hole slightly since they were a bit worn and so it would fit a common size bolt.
I am at the same point! Both my carriers had standard bolts- I was looking for something more “trick” and am trying to decide between a socket head or a 12 point ARP.I wondered the same thing. I was thinking of going a size smaller and using a brass bushing.