Here's how I attached the baja 5b rollcage and its wing mount to the muggy wing mount for what I think is a very sturdy wing mount (I'm waiting on a baja wing in the mail - I put a 1/8 wing on it but it looked too small).
I cut the muggy wing mounts and drilled holes through them for my extra orange tube (from the stock baja 5b rollcage) to fit through and screwed through the baja wing mount.
The baja rollcage is also attached to my rear aluminum shock tower with one screw on either side:
And you can see my new black rc-raven springs installed (also my custom esc mounting strap).