Otter Customization Question (Bench Seat Question)

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I am helping a buddy on a Otter customization project. He has the Large sled (which is the biggest one). Part of my design is based on the Otter bench-seat. He has been trying to find one locally, but it is out of season as one would expect, and nobody has any in stock. My question is...does anyone have the bracket centerline dimensions? What I mean by this is the 2 brackets that hinge on one side and rest on the wall of the sled that get mounted to the actual bench (horizontal bench supports), what is the actual distance from centerline to centerline of the brackets.

Why this matters is that if I don't lay out the compartments and bucket spacing properly, those supports can interfere with the height of the buckets, and the bench seat will not swivel down all the way since they hit the bucket.

I hope this makes sense. If it doesn't make sense, post and I'll try to clear up.