Ok cool, well its the original A15 carburetor that came with the engine, but the original air filter pan is made differently, that is, it is small and does not house the filter. i got the engine like that from Japan, I assumed that it came off a commercial vehicle . It looks like the pan that it came with was ducted to a box with the filter, but I did not get that part with the engine. The carburetor is not the standard one that comes with the A series engine. I realised this when I was servicing the carburetor and had to get the gasket kit. The A series gasket was not lining up and the A series plunger was to small, after carrying the carburetor to the parts store, it was then i realised that the Nissan E15 gasket and plunger is the corrrect one for it. The E15 came in the front wheel drive Nissan B11 Sunny. Oh yes and I have this engine in a B210 Datsun 120Y. I hope this info helps a it more, Thanks.