davep wrote:The Butler head and shoulder restraints are SCCA Enterprise part numbers that you buy from them (not from Butler).
DaveP
9.1.8.C.22.ff allows the head restraint, which I understood as including head & shoulder restraint (see picture from the OP).
I was confused by your previous post were you said you just got shoulder support to add to your head support. That suggested to me that you were getting the Butler bolt on brackets to add to the seat for seperate head & shoulder support. Which aren't clearly OK, but maybe could be argued to be allowed by the 9.1.8.C.22.b Seat modification allowance.