This is the Jack Rod holder for the 1969-73 Datsun 510 Wagon. You need 2 of these to hold the long jack rod in place on the floor of the drivers foot well (left edge). There are 2 x 3 prong metal fingers which hold these to the floor. I've printed a few and they fit the jack rod and mounting great. I'm going to make a version with a couple screw holes to install where the metal finger holders are missing (rusted away).