buckwheat,
if you decide to get rid of your screw type jacks, i may be interested.the "75" i just got has them. they are a big improvement over my old crank cable set that came with the"64".mine has two different mounts front and rear . the back slides into a horizontal pipe bracket. i'd like to adapt something like that for the front so the jack could be a little farther out from the truck side.i barely had room between the jacks to put it on the truck to move into the garage for repairs.i'll try to load a pic of mine . maybe yours are still a improvement over my screw type jacks.
thanks,wes