What is the steering column spline pattern on my 2002 SV?

It seems to have 12 separate splines and a section where the groove between two splines has been left uncut, so there's a flat section. Was the column made specifically for Caterham or is it some common car type that was used? It's obviously a quick-release column, so he question is, can I get an adapter boss?

I've just bought a Moto-Lita with no boss and need to buy one to fit.
My QD Momo has play.

Ignore this....it's got a Lifeline-fire QD hub. I can re-use it with the Moto-Lita by making a flat adapter plate.

http://www.lifeline-fire.co.uk/content/data%20sheets/Steering%20QR%209%20Hole%2009.pd f

Hal

Serious engineering in the hub, with groovy 60's 'Swingin London' Lotus centre badge! (It still has Caterham badges front and rear)