I've installed 3 E-lockers, two standard and one reverse rotation.
I used the standard studs front and rear on my rig, but when I installed Bevin's rear E-Locker, because his truck is a BEAST, we decided to upgrade to 10mm studs.
We used 10x1.25 studs from our Dual Case Crawler Kit and for the long studs, we used the long factory T/case 10x1.25 bolts.
The bolts are working great. It was hard to locate long 10M studs, so we just opted to use the Toyota T/case bolts.
BigMike