When I think of flap holsters marketed by Ruger, I must think of the Practical Holster, made by Bianchi or Cathey. I've seen and owned many of these, but only for Single Actions.
For the Standard Automatic Pistol? I didn't think they did. If anyone knows better, please show us.
http://www.rugerforum.com/phpBB3/viewtopic.php?t=137996
https://rugerforum.com/phpBB3/viewtopic.php?f=18&t=206009&start=0