I can't read the casting number in the second picture, Dwight, but if it's a Spicer yoke you should be able to identify it at the Dana-Spicer (
http://www2.dana.com/expertforms/departid.aspx) website. It looks like a cast piece anyway, and I agree with John, you'd be better off using a forged yoke that utilizes u-bolts instead of capscrews and straps. The Moser catalog would be a good place to start.
Lew