Main carburettor body Genuine Weber 28 IMB 5/250. GENUINE WEBER 28 IMB 5/250 FOR CLASSIC FIAT 500 FIAT 126. Suitable for a plug and play experience for the Fiat 126 595cc 650cc engine. Can be also used to increase power to your Classic Fiat 500 499cc (you need 28 IMB manifold).