The two different Bolt Patterns are 2.75" (MOMO) to 2.875" (Nardi) & 2.875" (Nardi) to 2.75"(MOMO). - Adapt Nardi/Personal to Momo Adapter. - Adapt Momo to Nardi/Personal Adapter. - Can also be used as a spacer to bring the steering wheel more closer to you.
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