Well short of being there we're just guessing. Generally if the linkage is coming from the front, as in a column shifter, the tabs point down. From the rear, the tabs point up. both linkage arms (that go from the trans to the shifter) should connect to the tabs from the TRANSMISSION side, with the tip pointing AWAY from the trans. The 1/R tab isn't flat, it's S shaped, and should S TOWARDS the transmission. See your picture in your first post. Maybe it's just the wrong shifter which is why the PO put it on wrong to begin with, just to make it work. Although your diagram looks like it's the right one. Make sure you adjust the linkage where it connects to the shifter to see if you can get some more room between them. Or try posting a picture of the whole set-up. It also looks like you have the correct linkage for each tab, but check. According to the diagram, the one for 2/3 has a slight S just behind where it connects to the tab. The 1/R is straight there.