I'm pretty sure that Jeff over at Stable Autoworks http://www.zcarkits.com/ has both the Alpha 1 and Simpson GTO dashboards available. I have the Alpha 1 type in my car http://www.hybridz.org/Review/0002/GTO_31.jpg Jeff gets around $300-$350 for them I think.
BTW, the plastic steering column surround doesn't hold anything together. Everything is mounted solid to the steering column.
Also, I do not use the "stalk" on my car either. I changed to switches mounted on the console and just glued a black plastic body plug in the hole it left in the surround. I do however, still use the original ignition switch since it locks the steering on the car.