I'm assuming you don't have access to the frame you bought?
If you don't, frames are usually made to fit centerline to centerline of the boat, maybe 2-4 inches wider.
Per the RMR website, your boat is 6'10" wide and uses 20" tubes. That would give you a CL to CL measurement of 62". An educated guess would put your frame at 62-66" wide. Bimini frames "spring" in or out 3" to accommodate various widths from one frame. I'd get bimini frame in 66" or thereabout.
Don't Wanna Die Askin' for Another Chance