[GTyankee]

I believe that you will find that it uses a 9/16th" stud with the Metric threads

check out this site
http://www.roadkillcustoms.com

2002 & newer DODGE RAM 1/2 TON TRUCK ... 2 & 4WD Bolt Pattern ...Metric: 5 X 139.7 ....Standard: 5 X 5.5 .... Stud size 9/16-RH .... Center Bore 77.8

Read more: DODGE RAM 1/2 TON TRUCK 2 & 4WD Vehicle Bolt Patterns, Specifications and Information http://www.roadkillcustoms.com/hot-...-specs.asp?Makes=DODGE&Models=RAM+1/2+TON+TRUCK+2+&+4WD&year=2013#ixzz3HO7czVVZ
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It is covered quite thoroughly on this website, i believe that the preferred brands of studs are covered
check out what is being typed by Z members

https://www.google.com/?gws_rd=ssl#q=2013+ram+1500+wheel+stud+size