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set of smaller fender type washers to help support the face of the shift rod at the shift toggles
I saw that side to side movement and corrected in the exact same way 
this is the OE 83 shifter and came with the zerk fitting,,I did not know it was there until I disassembled the truck, doubt if Dad did either, so it was living on the factory lube for the past 30 years
the stop bolts should help prevent wear on the trailing end of the rod tabs,,
as part of the re-new project on the 83 D-150 had Brewers go through the tranny and shifter,, and now with the rods properly adjusted and the stop bolts,,and with the shifter lubed,, and this is with the truck setting in the garage, motor off, every thing cold,,, the dag-gone thing has never shifted a cleanly as it does now,,