SB Pulley Help Please

I have a few of those used 2951836 single groove water pump pulleys. The first run 70-early71 of those did not have the number stamped in them i believe in late 71 or early 1972 they started putting the numbers on that particular pulley. Priced from $15-$35 if 4spdragtop or the others who are looking don't get you fixed up PM me for pics and shipping cost