Question on power steering pulleys

[Norgermish]

I recently picked up a power steering setup for my '67 with a 250ci engine. I got it from Langdon's Stovebolt for a fair price. Only problem, the pump he sent is not even close. It has metric studs and bolt holes, (Tom refunded me on the pump). Anyway, I was wondering if the small block and 6 cyl. PS pulleys are in anyway interchangeable. Having a heck of a time locating a PS pulley for a straight six at a fair price.
Thanks,
Paul