The Matco one is probably an OTC socket anyway. It turns out this socket was used by GM for over 40 years. The part numbers are, OTC 1929 for the 1 ton socket and OTC 1930 for the 1 1/2 and 2 ton socket. I found a guy on ebay that has the 1929 for $38. Unfortunately he wants $10 to ship! Now that I know they are out there, I'll keep looking. Thanks
Bruce
