What kind of tools do you have access to? You can make your own shackles easily and they are a good first project I'd say.

I guess the big problem is the "step" on the stock shackles, right? I bet you could make a step in a set that you made by welding in a small bit of tubing or something similar.

I see you are in Lafayette, CO/Farmington NM. I'm in Lafayette too, so I could help you some weekend. I have a welder, drill press, and angle grinder.

Chip