I also have the Motherwells solo rack, but was not pleased with it for a couple of reasons. One, the rear mount was not welded square to the line, and it causes it to be higher on one side than my laydown license plate. At least that's what I think. The other problem is that I wish there was more distance between the bottom of the rack and the top of the fender. The reason is that I have a solo bag that I used to leave attached to the solo rack and just kept it on the bike. Now, I want to be able to take the bag off easily when I am going for a different look. The HD rack was going to suit my needs I hoped. The part number for the rack I got is 53493-95, and the one that actually fits is part number 53511-06. My solo bag is made by H--da, but does not have any logo on it, just studs and a chrome buckle. It's a nice bag, but I have to mount it to the rack with quick ties.
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I forgot to mention, I do not have another rack yet. I guess I need to post it on the forum for sale. I do have the same bike as you. Mine is black cherry.