My favorite kydex revolver holster/speedloader holder combo comes from an outfit called Ready Tactical. It's for an N frame Smith but I have some of their speedloader holders for my K frames and they are phenomenal.
Try to call Chris at Ready Tactical directly. I had a really good experience dealing with him but some folks haven't. His website is
www.pistolpacking.com
His gear is great, but you need to speak to him about delivery dates.