Found these at a friends shop...came off an '81 march C chassis...sizing is almost perfect with a slight difference in backspacing (Approx 1/8"), just need to fab some adapters and clean them up. They are magnesium and so far look like no cracks or flaws...probably have them checked anyway...pattern is very close to BRM wheels with a six pin BC in the rear. Fronts are 15 X 10, and rears are 15 X 14.
Cheers
Phil
Cheers
Phil