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I dont really know much about roll centre.
With mounting the stubs and using the tapered sleave on the bottom ball joints, I have positioned the top and bottom ball joints centres, to be the same distance apart as what the stock 1000 ball joints are.
The actual stub height is 1 inch higher on the HZ stubs.
Does this affect the roll centre? Hopefully what I described will give you an idea.
My wags and its suspension isn't being built for track handleing, so I never focused on any thing like this, except keeping basic geometry. My wags is solely being built for having fun and dragging body.

I have done a similar conversion to this but made an Aluminium front spindle and caliper bracket. As I am using the car for circuit racing and am running 13X7 racing tyres front & rear, I want to change the front spindles before they break as everyone has been telling me.

Buy changing to HZ stubs do you know what this does to the front roll centre?

I wll most likely modify a strut assembly to keep the weight down. I have used HQ-HZ stubs before, they are very strong but also very heavy for a small car like this...

Thanks for the feed back...

This is a pic of Ianey's brakes. If you look closely and compare to original, you can see the crossmember mod.
You can read about Ianey's brakes Here

I originally fitted XF falcon balljoints to my 1000's control arms so I could use the XF stub axles and brakes etc.
I have since changed the top balljoint to HZ holden and have fitted HZ stubs and brakes. I machined up a tapered sleave so the bottom ford ball joint would fit the HZ stub. With the bottom ball joint it was easier to fit the ford item. The change to the HZ stubs allowed 15 x 6 wheels to tuck in the guards nicely ( my inner guards arent stock so I dont know how well stock would fit)
Steering is just a HZ outer tierod and steering arm machined to fit the 1000 inner tierod. Both setups need the steering angles modified to suit the 1000.

Both setup require the crossmember to be cut back and the bump stop moved inwards to the outer most crossmember mounting bolt. This needs to be done to allow clearance for the brake caliper when turning. I am sure Ian has a pic of his brakes which shows the same crossmember mod. ( I will look for it) Mine is in pieces now, so I cant take pics of it. I am also using a complete made up crossmember for other reasons.

I need some heavy duty front stub axles for my 1000... Has anyone here ever found anything off another car to fit?

I am looking at modifying some struts to fit in but thought I would ask if anyone else here has fitted anything before???