Hello: I have a 1979 Fiat X1/9 (1.5 L). Ordered a new new Weber carburetor (listed as # 18890 244). They told me for sure this is the correct carb for a 1979 X1/9. Tried to install the new carb but there are some differences from the old carb. Any help on how to modify/install would be appreciated. Thank you!