It can be difficult, some front wheel drive hubs have poor geometry simply because they're for a fwd car. These uprights are designed for things like torque steer and are usually not tall enough for our purposes.
The only way to get the ideal upright is to design and build your own.
Uprights other than Ford will not have the 4/108 PCD either which means that you'll have to redrill the hubs or use different wheels front to back.
Having said that Tiger used to use the Mk2 Golf upright.
Cheers
Chris
