I believe those were made by MC Enterprises Bill, but discontinued for a long time. They made the same squared-off design for multiple different bikes, and I cannot tell if those are for Valkyrie.
Often referred to as curtain rods. Their bag guards and bag and trunk racks were of thinner stock than anyone else's.
Not on their website, but if you called, they might be able to send you a parts diagram and parts list (hardware) for them.
http://www.mcenterprisesusa.com/