Square knob pic for thread posterity.

For WM and WS-w/rallye, at least the ones I have taken notice of or have photos of are square knob. Any build date/plant where I have that info.

The few WS-w/sweep and WP I have pics of are square knob as well, but (coincidentally) they look to either protrude out or fit uneven at the bottom. Not enough to go by, but maybe the non-rallye face plate is shorter.