Eaton does not supply ring gear bolts with their positraction units, if you need ring gear bolts, DO NOT buy bolts with the SMALL 5/8" head! GM uses a special 3/4" large head bolt with tiny "stair steps" in the underhead seat, this keeps them tight and supports the bolt. The 5/8" headed bolts only have .062" flange under the head and it will sink into the carrier after a while and come loose. Use GM # 1241564, or Mr Gasket #2092G bolts. I haven't been able to find ARP bolts for this axle. Bolts are 7/16" 20 X .850" LH thread. Units using a ring gear spacer require a longer bolt, which is available.

Here is a Ratech bolt from Summit with the "small" 5/8" head.

http://www.pozziracing.com/Media/ring_gear_bolt_sm.jpg

Here is the Mr Gasket 2092G
http://www.jegs.com/images/photos/700/720/720-2092G.jpg