Here are the specs for the ring that goes with the rim. Notice there are two rings for each rim. Notice the groove cut to the back of the ring to help hold the bead of the tire.
I have also enclosed a pic of the bolt that will be used to hold the ring to the rim. I will be getting my own bolts so that is NOT part of the quote.
The bolt is as follows:
M3-0.5 x 12mm Cl 10.9 ISO 7380 Pln Button Head Socket Screw
http://www.fastenal.com/web/products...l.ex?sku=40870