I got my original style knobs as part of KevinW's group buy and they look great.
The challenge comes with sourcing the correct switch. I found some 3-position rotary Lucas switches that have a push-to-wash facility. The 3 switch positions don't in themselves provide the park facility. However, I wired up the push-to-wash as push-to-park.
I now have 2-speed wipers that stop at the point they were at when turned off and a momentary push on the knob parks them correctly. Sorted and dead simple.
Paul