http://www.strapworks.com/ProductDetails.asp?ProductCode=CS2H

Pretty much any length. I'd recommend 8' for single and 10' for double hang
gliders. You can order it with a pad under the cam.

If you want lighter weight straps that can certainly hold the load, check this
out:
http://www.strapworks.com/Metal_Cam_Straps_p/cs2l.htm

Two pilots recommended these:
https://www.amazon.com/gp/product/B00NODLUGI

Luke waters says:

I cut the neoprene part off because it just gets in the way of
using the buckle. There is a fabric piece that the neoprene is attached to that
stays on and protects your glider from the bottom of the buckles. They are 12'
long and will work for 3 gliders, with one pass between each glider then one
pass back over the tops of all 3.