If you can identify any of the jacks which is difficult. You can find some pictures on line if you look for vintage bumper jacks. and on Ebay. Some jacks are bringing 300 plus on E bay. Jacks do often have patent nos and date codes and bases sometimes have letters stamped. Jacks are becoming very hard to find, I walked a number of wrecking yards with no success. Finally found correct jack for my 57 Ford on E bay 250 plus shipping. Don't throw them away.