I picked them up from a guy off Ebay. But let me tell you, what a pain! The 1st two shoulder harnesses that I got were missing a specific buckle and strap that is needed. Two more shoulder harnesses later, I finally got what I needed. I found another guy who I'm buying those buckles/straps from to complete the other two shoulder harnesses that I have. If anyone is interested, I will part with one of the harnesses that I have when the buckle/strap come in. Let me know if interested and I'll sell it for what I have spent which isn't much.
Edit:
I found a waist belt that's pretty cheap that I'll bid on to complete the whole setup and can sell it complete. Only for what I have in it though.