Rear 930 rotor on to the 1970 original hub?

[Burint]

Hi
I am working on my project car.
1970 rs body kit, 3.2, G-50 and a set of 930 brake.
The front caliper and rotor are bolt on with the VCI hat.
The rear calipers are already remachine for the new mounting spot
BUT
How can I mount the rear 930 rotor on to the 1970 original hub?
Do I need to use a set of aluminum trailing arm?
Thanks
Burint
Bangkok, Thailand