Are you adding hydraulic to the diverter? or adding a diverter with hydraulic?
The berk steering tiller has a place for a 43bc...a 43c is used on the throttle among other things, but not the reverse gate, that I am aware of.
The place diverter arm has a place for a 43bc, too, but its not the tiller and its on the other side (RH, Vs. LH JC Berk style)
Any local boat shop should have or can get the 43bc cable in whatever length you need.
Not totally screwed, just take the reverse gate off.
Dan'l