I have a 6245 on the E350 chassis so my situation may be different from yours. I wanted to add a swivel base to the passenger seat but was worried about it fitting so I contacted Gulf Stream. They said I could add a swivel base if my floor behind the seat had a notch in it, which is the small step up from the floor of the cab.
I’m not sure how to attach the picture she sent me. If I figure it out I’ll attach it. But my point is you may want to contact them before spending the money.
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