For all those fitting a Corsa C EPAS (Electronic Power Assisted Steering) to a Kit Car or Hot Rod the following maybe helpful.
This Haynes Roadster has parts from many makes and models of cars: Ford Sierra 4x4 Cosworth, Scorpio, Jaguar X type, Austin Ambassador, Citroen BX, Mercedes SLK etc.
Getting the dimensions correct for this custom Ford Sierra Upright hasn't been easy. The reason for making a new upright was the steering arm on the standard upright being wrong for my particular application. Therefore getting the next stage right is very important.
I've been boxing in one of my custom Ford Sierra Front Uprights. They are made from solid EN3B steel along with 3,8,12mm steel plate.
I had to enrol the skills of the 'brother in law' to TIG weld the new Ford Sierra based front uprights.
This is not a DIY Sierra brake upgrade, more of a complete re-think. A set of W220 Mercedes callipers came up for less than £25 (inc. delivery).
Ackermann angle geometry is a tricky subject and often over simplified.
If you swapped uprights from one side of the car to the other the Ackermann Angle would be very wrong.
The Citroen BX rack has meant several changes to the steering, propshaft and exhaust manifolds