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18mm ID 21mm OD
Posted by Jeremy on Jul 28th 2019
Exactly what I needed for my bike. The owner give me directions on how to figure out what shim I needed, gave him the measurements and he immediately knew what I needed. He shipped it quickly and I couldn't be more happy with this product. Works great with my carb and speed kit.
Posted by Unknown on Jul 6th 2017
Exactly what i needed.