I would think any C10 "end link" style sway bar would work if the "eye-to-eye" measurement is the same as your a-arms.
Since you do not have the narrowed version,... I would think a stock sway bar could be mounted to the frame,... just a little forward of the factory position.
Plus I would eliminate the factory frame stands and attach the bar directly to the frame rails.
Here's a few listed from Summit Racing:
http://www.summitracing.com/search/p...del/c10-pickup
Can you give Addco a call and get a part number,... then purchase the bar thru Summit?