BigBikeParts makes a great solo rack for the Valk and it is quite resonabled priced.
Check Direct Line Parts.
I don't think you will find that one available anymore, unfortunately. I have been on a search for one to match my Big Bike Parts (aka Show Chrome) saddlebag racks. I did find it listed at Extreme Revolution (now
www.FastCycleParts.com), however I called and they didn't have it but checked with Show Chrome/BBP and it is discontinued and unavailable.
Wouldn't it be great if we could send a Petition Letter/Request for them to make another batch..... I bet they could sell a hundred.