Recent email from Janspeed:
We no longer have any jigs for these parts as we only ever made a few many many years ago, we have discontinued most xpower parts now.

I then asked whether they had any design information in the archives...to which they replied:
We don't have any information on these as when they were made the first time, a set was made to fit on the car and then a jig was made up to reproduce them, but like I said we no longer have any jigs,sorry.