Find the VIN for your CNG car, then go to the '
ePER' link in the blue bar near the top of the page. Then:
Select language/country/left or right hand drive. Click 'Go!'
Click 'Spare parts'
Click 'Fiat'
Enter your VIN in the box at the bottom of the column on the left hand side, then click the search button (magnifying glass)
Check that your vehicle details are correct, then click 'next' (bottom right button)
You'll then see an illustration of a Multipla and a category menu on the left hand side. Start searching for your differential gear. It looks as though it will be in Section 212 or 274. Remember that some sections have more than one page - you'll see them all at the bottom of the screen for each section.
In the parts tables that are shown, any parts that will
not fit your car will be shown in grey text instead of black. Make a note of the part number for the differential for your CNG car.
Look at the part numbers in the same section. Each Multipla type has it's own model prefix (for example, for my car - a 2004 JTD CF3 - it's 'M7'). You'll need to find the code for the 182A4000 engine.
It may be worth trying the Search on the
ePER page (at top right, just above where it says "DVD Rel.20"), putting the part number in that you got for the CNG engine. That will tell you what other cars use it.