I don't own a CVO, but the basic model, hopefully I am welcome here. And I'm not sure if the two models are the same as related to the riser/bar setup. I think just the bars are different. So this post is for the FXSB only, and not the CVO but hopefully it helps somewhat.
I will be looking into 55800252. I am interested to see if the the riser and clamp setup are the same as stock. The picture on their website shows the clamp picture looks the same, but they don't have a picture of the risers. I'm going to ask the fitment specialist to see if they have schematics of this kit to try to get an idea of the riser.
With apes I prefer a straight riser as opposed to offset so I bought and am in the process of installing Harley's 12 in. Fat Mini-Ape Handlebar Kit with Riser-56832-04B. The riser height of this kit is the same height as stock, only it is straight and not offset like stock. I didn't want to spend the $400+ for 55800252 only to find out its riser and clamp are exactly the same as stock.
A few notes about 12 in. Fat Mini-Ape Handlebar Kit with Riser-56832-04B in black (I know most CVO owner's will probably choose chrome)...the bars are satin black, and the riser/clamp is gloss black. Makes no sense to me why the finish is different. Also, the riser will not work with the FXSB stock top clamp. The stock clamp has a skirt on it in the front that interferes with the kit's riser because the riser also has a skirt. This would be true for the chrome parts, too.