heard these --only help someone else---Bottom Cushion Base: Roughly 38 to 39 inches wide at the front, tapering slightly down to 36 to 37 inches at the rear. The depth (front to back) is approximately 17 to 18 inches.Backrest Cushion Base: Fits onto the inner skin of the trunk/rumble lid. It is roughly 36 inches wide and 19 to 20 inches tall.