Steering wheel Boss for 89 110

[Rangier Rover]

Does any one know what other steering wheel boss will fit my 89 model 120"? Leyland/Rover cars etc.
I'm keeping the Autotecnica wheel off my mitsu so hopeful of making it fit the 120 and get rid of the bus steering wheel that gets in the way.(Rover must have run out of mid sized wheels so went to the truck bus section)
Thanks Tony

[rovercare]

I've got a early RR boss on mine, needs a quick machine to accept the indicator canceller thingy......which I haven;t done yet:D

[Rangier Rover]

So the splines must be the same:D

[rovercare]

Which is 27mm, I've machined it now:D