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offset swivel base using a regular aftermarket swivel. The exact dimensions will depend on what slides you use. I got some power slides that are a lot taller than the original odyssey seat slides, so had to have much shorter swivels. We mounted steel plates under the floor to bolt into the original seat mounting holes and tie into the oem frame. In hindsight, I'd mount the swivel a little further toward the back of the coach to give more room at the steering wheel when turned.