actually i found out they are nut guards
and 183G, 202K, 308P, 551C, 3820G, 3823Z, 3909K, many AMKDEP and
BRAM buses
i think they look nicer that way NOT REMOVED!
Nut guards REMOVED recently by slbp (Sep-Nov)
113J one side, 301H one side, 520S one side, 526B one side, 3873D,
498Z had 1 side left oso removed
usually ex BRAM or AMKDEP buses still have them in tact like 113J,
202K, 301H, 3873D.