Dude you have everything to run it on a 1600 single port motor, the adapter was sold with the nikki carb so it would fit the vdub manifold, and get the throttle linkage working the right way round, the only thing you need to find out is if its jetted for a 1300 or a 1500/1600cc.
The only other thing your going to struggle with is spares, have looked all over not been able to get any response out of the few places Ive found.