Hi Glen,
I've done a fair bit of messing round with front brakes now. My front spindles are Jag and my hubs are home made but the principle is the same.
HQ run a 1 piece hub disk so you have to run aftermarket hubs. There should be a lot more aftermarket hubs available for HQ than Jag at least. Do the Wilwood ones fit OK?
Things to think about
:
Wheel track: Where the mounting face for the rotor is in relation to the hub will effect your wheel track and the offset you will need for your wheels to keep them under the guards.
The offset of the wheel will determine your scrub radius when turning/steering the wheel. The scrub radius or I think called Scuff radius sometimes is the distance the center of the tread is from the axis the wheel turns on as it steers. The smaller the scuff radius the easier the steering effort and it reduces the kick back from bumps and potholes as the wheel effectively has less leverage.
The other thing to consider is clearance to your caliper mounting brackets. This is pretty easy to work around if you are running radial mount calipers. Lug mounts need a bit more messing round to make the brackets.
I've posted these pics before but here's a shot of the new hub with radial mount caliper bracket behind it.
Here's the hat style rotor mounted.
6 piston radial mount caliper bolted up
Cheers