Rear seat belt plates from 70's abody

Any body cutting up a 70's a-body with some good seat belt anchors?
I'd like at least the four for the rear seats, I'm thinking of upgrading the seat belts in one of my 60's darts to retractors all around. Cars down here didn't require seat belts in the rear till 78, so factory anchors are hard to find, even on Australian made a-bodies, I'd rather not use aftermarket anchors if I can help it.
Cheers