[CompClassics]

Just for the record the color photo and the black and white photo of the different linkages I posted above are all SAI, the color photo is of CSX2155s engine and the black and white photo is from a SAI parts catalog.
When it comes down to it though, if you can make a linkage that works well for you and doesn't need constant adjusting it doesn't matter what it looks like unless you are trying to make it appear like the original SAI parts.

Here is a parallel SAI system that was removed from a Cobra in the early 1970s........