I know they bolt straight up to the HQ calliper when fitted to a HQ stub axle. All the Hatfield kit does is move the mounting point of the calliper on the Torana stub to match the HQ rotor. So I'm guessing they should mount straight up.
I know some people have problems mounting up the bigger brakes on Torana Stubs, when at full lock the calliper hits the X-member (I think it's tight around the lower control arm as well). Many people just grind a chunk out of the cross member, but a better way is to run a set up simular to the Bathurst A9X. That is put the left stub on the right and the right on the left, this brings the calliper to the front of the disk and away from the cross member. You will need to change your steering arms though. (Good luck finding A9x ones, I was silly enough to try back in 98). From memory the HK utes used the same steering arm.
Not all 7 series are the same. You will need E23 single hose jobbies.
