Wanted: 7-1/4 Sure-Grip for '68

I would check ebay, these are pretty rare and possibly spendy. I parted out a 66 Cuda-S awhile back, the car was a 273 Commando 4-speed with an 7 1/4 rear, thought it wasn't correct so I junked the rear. Find out later that it was correct and probably had a sure-grip in it, oh well, live and learn.