I dont have the part number
We had ours up last weekend going full throttle around the lake, no issues.
When it is "down" it lays right on the back of top of the rear seat (totally out of the way). Ours is charcoal grey and is waterproof. It is very heavy duty durable material not cheap thin stuff. We do have an OEM cover that we ordered from the dealer as well and it has velcro flaps on each side (which I think was for the wakeboard tower???) but it works perfect for the bimini. We put the cover on and it holds the bimini down tight while trailering. My husband and I have an extra bimini that we bought because our original dealer was backordered. I looked at my receipt and for the bimini and boot cover it was $658 incl. tax so if your interested we could probably work something out, or you can go thru your dealership.