Hard to pin down how many Z10s in the mix; estimated to be 350-450. There were 10,026 ZL2 hoods; subtract 3,675 Z11s and 400 Z10s leaves 5,951 hoods to divide up between Z/28s and the remainder of SS production. There were more SS built than Z/28s so it is likely SS installation was higher.
Of the remainder, guessing SS 3,764, Z/28 2,187. Don't take it to the bank.