5-Lug Vented Rotors on Rear, Some Questions Options

[Spoke]

The next project for my 914 is converting to 5-lug suspension. I have the front struts and rear hub from a 1972 911 to start with.

The rear will have vented rotors. I have some questions about doing this part of the conversion.

Two questions:
1) Will I need longer studs in the rear? Before adding the spacer, a lug would catch with 11 rotations on a stud. After adding the spacer, a lug catches with only 8 rotations.

2) When I add the spacer, the rotor is no longer centered perfectly on the hub. How do I center the rotor on the hub?


911 Hub



Hub with spacer



Hub with spacer and rotor. 911 rotor has been cut by Eric Shea. Thanks E.



With the spacer, the lug only catches with 8 revolutions, down from 11 in its stock state. Is this enough or do I need longer studs?



With the spacer, the rotor lip that centers it on the hub now misses the hub because of the spacer. How do I center the rotor now? Do I use just the 2 little hold-on screws to center?



One of the calipers that will be used.