To find if JR has the servo you want in a reverse style, search for the servo you want, and add an "R" to the end.

Here's an example (Note the "R" on the end of the URL)

http://www.horizonhobby.com/Products...ProdID=JRPS821

And the same URL which I added an "R" to

http://www.horizonhobby.com/Products...rodID=JRPS821R