Don,
I think they work like this:
View attachment 423
There are two parts. 1 is the foot peg itself. It is only the
horizantal part visible in the picture. It costs $40.00
The 2nd part is the "displacement arm." It fits in between the tabs on the NT where the stock footpeg goes, and then apparently can be angled differently. In this picture it's the vertical part. It comes in two lengths, 23 mm (app .9") and 30mm (app 1.2"). The displacement arms cost $55.00. So it's in the same ballpark pricewise as MCL's.
Oh, and I think there must be a bolt that goes through the displacement arm and screws into the footpeg.
But I don't know.