You said 5/16th, likely mean 15/16. If so this is what I just installed on our Challenger. You do not say what car you have. Challenger was all drum, now converted to front disc. No power brakes. With larger bore MC had very poor front brake performance.

http://www.amazon.com/gp/product/B001PYO1PU/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

Also just installed ceramic pads. Have high hopes once I sort out a silly Wilwood caliper issue. Has to do with their minuscule non standard bleeder valves.