Jerry67 over on Team Camaro posted information on this that I have been looking for for years and years!!
Most everybody I've asked said they thought it was an add-on Hone, Gear Venders or a US Whatever, but I knew this SOB existed...
Take a read and if we could only buy it now!!!
http://www.camaros.net/forums/showthread.php?t=100779
Scroll on down to almost the bottom!!
I gotta really hand it to Jerry b/c he must squirrel away old mag’s worse than I do...
pdq67