The U-joints are still a standard Spicer joint. I will post the number I used later.
The straps used over the joint caps are also an off the shelf product.
The U-joint crosses I used on my C15A are Spicer 5-178X and the U shaped bolts used to attach at the transfer case to transmission shaft were Quality Gear 3-94-18x.
Based on info in
http://www2.dana.com/pdf/DSAG-0200.pdf it is confirmed these parts are often used together and that 3-94-18x is not only a number from Quality Gear but also a Dana/Spicer number. There's more than enough info in the linked document but the link between 5-178X and 3-94-18x (and 1350 series joints) is on page 26.
Mine were bought at the local heavy truck parts and service shop, my F-350 is about the lightest thing they work on.
One online source is at:
http://www.northerndrivetrain.com/pr...PI-5-178X.html and
http://www.northerndrivetrain.com/pr...-3-94-18X.html
These parts are also available fron Jegs online (for more $) and almost certainly other sources