Ebay Rear Disc Conversion

There is a very inexpensive kit on Ebay. Anybody familiar with this one?

http://www.ebay.com/itm/mopar-8-3-4...Parts_Accessories&hash=item35af5fe3d4&vxp=mtr

I'm going to send them a message and request install doc or more specs but would like to hear if anybody else has experience with this.