I just bought a Fobus paddle holster for my .357 LCR, and the store's display .22 LCR fit it perfectly also. The retention adjustment was exactly the same.
Desantis makes a thumbreak dual position (strong side and cross draw). I bought a tan one that works great. However, I bought a black one and I couldn't get my .357 LCR into it. I gave up and returned it. Did not have that problem with the first one.
Depending on your needs, if you want to tote a Ruger LCR revolver in a pocket holster, I suggest the slick DeSantis Nemnesis.
I purchased a DeSantis Nemnesis in 2004 for my Ti frame snub Protector with 0 problems.