JC
My kit already had this gear with it but the best advice I've heard is to try and use parts from utes to replicate the general weight distribution of a cobra.
Makes some sense as the ute rear has little weight in it like a cobra.
All I know is that my Ford - Sigma master-booster combination passed the braking test but my engineer was keen to see if I could engender a bit more overall braking performance.
He suggested trying to transfer some more of the braking load to the rear brakes by way of using a different crack pressure setting.
The suggestion means a switch in a set spring that modulates this pressure and I only had one option with the gear I have. I had this change done through my brake shop contact but am yet to put it to the test on the road.
If you can go with something more current try and do so and all you have to match up is the fitting arrangements to the standard pedal box, if you are running this and that can always be modified for a different attachment arrangement anyway.
A couple of photos from my photobucket account of the very thing!
Anyway good luck on the research and I'd be keen to hear more of what you decide upon.
Slo