new sway bar

I just got a new Addco 1" front swaybar for my 1968 Cougar (basically same as a mustang). The previous owner removed the original sway bar for drag racing. Also there are new lower control arms on the car too.

It looks like the bushings do not fit properly in the hole in the control arm, they are loose and not properly seated. Looks like there should be a part called a "seat" for the bushing to properly seat. I see this part (3042) in the 1968 Cougar shop manual on page 3-19, but not on my control arms. The instructions with the sway bar says that some of the hardware from the original must be used. I assume that this is one of those parts along with the bolts/nuts for the brackets.

I have looked online and cannot find this "seat" anywhere at mustangsplus etc.

Does anybody know where I can obtain these "seats"

Also for the bracket bolts/nuts that are missing, I could just get them at a hardware store. Any particular grade bolt that I should be using on these ?