If you can't find an actual I/O bulkhead like the ones they used on some of the later 11/23's
(with a male header on the inside, and an actual RL connector on the outside)
you can also try two other methods. . .
1.) A male-to-female ribbon cable (extension). The male goes through your I/O bulkhead,
and your old-style RL cable connects to that.
Not a pretty solution, and not RFI compliant, but by far the easiest to obtain..
2.) There is a shielded bulkhead connector (whose part number escapes me) that has male bergs
on each side. . . a ribbon goes from the controller to the berg on the inside of the I/O bulkhead,
and your old-style RL cable connects on the outside of your I/O bulkhead.
T