source for 8" trac-lock limited slip carrier?

Looking at the "automotive recyclers" (AKA Junk yards) I have run across a lot of open 8" carriers but have yet to find a used limited slip carrier on anything. Does anyone know what models might have came with the limited slip rear in them or another source to find used limited slips for the 8" rear? I've checked the big auction sites and classified sites and didn't find any used ones. I've seen new no-name ones for $325-375 but I'd rather have a factory unit that I can rebuild with new clutches and bearings and know exactly what I've got...

Anyone know where a stock 8" limited slip carrier that might be for sale is?

Anyone have any feedback on the no-name units from folks on ebay and such?

Here's the one I looked at ($320+~13 ship):
http://www.ebay.com/itm/370603385708

Seeming more and more like a decent deal considering how hard the dang things are to track down... I've done R&P setups before on a lot of 9" in the circle track cars that I've raced so the 8" should be a piece of cake just to swap the carrier into it and set the backlash. The engine only makes right at 312hp and figure with the C4 and a 3.00 gear it should be OK on the street and highway.