Magnum 500 wheel issues

Hi,
I am wanting to put a set of Magnum 500 wheels on my 68 New Yorker, i am looking at the Vintique ones, i can buy them locally here,
I tried a 15 x 7 but it fouls on the factory Budd calipers.
Is there a Magnum wheel that will clear the caliper in 15 x7 or 15 x 6,
Also the Ford rims are same bolt pattern but is the center hole to mall ???
I need some direction as to what will fit my car.
Any help very much appreciated
Thanks
Gavin
Australia.