It tends to be 14" alloys that dont work, 14" steelies can work due to their thinner bodies. 16" will be fine but you need to measure the overall diameter of the wheel and the tyre ratio, the sierra speedo is designed to work with 55cm diameter wheels. The 1" extension to the dampers is to help getting the correct ride height.
If your wheel above 60cm then you probably wont need the 1" extensions but then you will need to fix up an alternative speedo as it will be reading too slow.
AndyH
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