I've got a bus turn signal switch I got NOS from John Steele (still in the origninal packaging)- chrome shaft with a dimmer feature. There were some extra wires, so I figured out what I needed using a multi-meter, and cut out the rest. I'm not sure what year it was, but apparently the bus column was also slightly smaller than the Beetle column, so the opening in the housing need to be enlarged a bit (not a big deal, John told me I would need to). The only problem was that the switch is straight, rather than offset towards the wheel, so the switch ended up about 4" away from the (Nardi) wheel. I solved that by buying a shorter adapter hub for the Nardi from Henry at IM. I put a pin in the back of the adapter hub to cancel the turn signals. The setup now looks VERY original and positions the wheel closer to the dash- I really like the driving position. The stalk has the dimmer feature, cancels and looks original. Both John and Henry were great.
Henry is modifying the less expensive (66 Beetle?) switches by cutting off the stalk and welding on a polished stainless stalk, then installing a foot switch for the brights- smart and MUCH less expensive. Either option corrects what I think is the weak link in the interior (along with the e-brake).