Wilkinson had them listed pre-made at one time from billet aluminum. Ask him. If not, shop around at the various Pantera parts vendors. Some might make them for you.
They are not rocket science to make out of aluminum plate. It is just a matter of stacking up spacers to get the pedal position where you want it.
Mine are at 1-1/2". For me that's about right. I've heard others mention as much as 2" but the caution would be that at some point there won't be enough pedal travel before they hit the floor?
Because of the possible variations/combinations possible, you are better off stacking them until you find the right combination for you. Out of the box, 1-1/2" may be too much for you.
To my knowledge, there was a Ford Service Bulletin on this subject while the cars were under Ford Warranty. If I remember correctly, the suggestion was for a 3/4" spacer.