To fit most pit bikes with a 19mm opening on carbs
48mm centers between mounting holes
Fits many carburettors with 19mm or smaller carbs e.g PZ19, Molkt, Mikuni and many others.
This spacer acts as a heat shield to aid the starting of your bike when it is hot.
The fibre gasket is used for the bottom of the inlet manifold, and the plastic gasket is used as a heat guard between the inlet manifold and the carburettor.