I measured the inside diameter of the inlet that connects to the rubber boot on the reedcage (I guess thats the "intake manifold")
Mine measured 36mm. I then looked up the number of my carb and found it was a Keihin PWK 36mm Airstryker.
Measure the side that goes to the engine and not the side the air filter connects to.
Unless Im wrong, if so, someone please correct me.