Arch shapes for Adobe Photoshop CC 2017 2015 2014 CS6 CS5 CS4 etc and Photoshop elements gallery (Volume 74) 240 Arch shapes / vector designs. CSH
Another option if you want arch designs and especially if you want to use them in other applications then the arch fonts may be of more use for you. The arch designs are very similar to the horseshoe custom shapes set so they may be of interest as well and also the arc font shapes like designs. What can you do with them, well they are great curved artworks for all kinds of frames, edge effects and much more.
You can find many tutorials on the site such as how to use the Photoshop shape panel options such as constrain and center etc tutorial