Or
Pinwall Cycle Motorcycle Salvage (which also has an Ebay store). But I don't do Ebay, and hate having to search through pages and pages of stuff, so I just called them direct, told them what I needed (rear wheel), and they had one, and we made a deal, and it was here in a few days.
It's always important to ask for pictures or part quality assurances though, because discovering it's junk after you get it sucks big time.
https://pinwallcycle.com/http://stores.ebay.com/PinWall-Cycle-Parts-IncHere's some: http://stores.ebay.com/PinWall-Cycle-Parts-Inc/_i.html?_nkw=valkyrie+center+cover&submit=Search&_sid=12458664
Yes, keep in mind that side cover tabs break all the time, and there are dozens of threads on here about it, and even a Shoptalk article on home repairs and work-arounds. (glue and clips and Velcro and grommets, yada)
http://www.valkyrieforum.com/bbs/index.php/topic,89401.msg995977/topicseen.html#new