Looking for the nut that holds the pulley on the pump. Car is a '71 Skylark with 350. Have two local cores but had to cut the nuts off just to get at the pulley. Looks like 1/2" with a fine thread. Nut has a tapered/rounded edge, away from the pulley. Been looking for a bit now, local suppliers can't match it. These available anywhere??? Thanks for the help.
