Hi Jon, now we see the value of one picture!
Ok, 2wd Cossie, and US Spec Scorpio have the same diameter disc as the 4x4 but it's non-vent.
You still didn't say if you want specificly the Ford 4 on 4 1/4 bolt circle.
The Scorpio has some spasssy 5 bolt pattern.
Reason I ask is cause you can always index the flange over and do a new 4 bolt easy on 4 bolt, and easy 5 bolt on old 5 bolt so this gives you options.
I will say the stuff is reasonably sized in terms of bearings and CV size, and we know it's good for the stock car's 150mph (with a sedan weighing 2500 to 2750lbs.
What you gonna do for a rear diff etc.
You know a lot of the Caterham and Westfield stuff these days is Sierra stuff, Caterham uses a Ford 7" Diff with the std VC and 3.62 ratio. Some guys sure like the Typ9 Ford box too, cheapest gearsets out there.
And since you're gonna be making something that actually go fast I would be wary of say Miata stuff, it seems as tho the Jap cars are always a bit stingy and give you just enough for the desinged job and not a bit more...
Come on, more details
John Vanlandingham