8.75 Rear End Disc Brake Conversion

I have seen these on ebay was wondering if anyone had used them.

http://cgi.ebay.com/ebaymotors/mopa...tZVintageQ5fCarQ5fTruckQ5fPartsQ5fAccessories

And there's Dr Diff kit , Cass is an awesome guy and have heard of no complaints on his kit.

http://cgi.ebay.com/ebaymotors/Chry...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories