Talk to any old farmer who drove these trucks to death,and he'll tell you to buy two sets, one for the glove box. Once these rubber parts get some wear in them, you will suffer the dreaded stuck in two gears syndrome and have to get out and unjam it. I made some brass bushings and can feel the shifting of the transmission through the gear shifter much better and I won't have to worry about replacing them. You might be able to find bronze bushings used for worn door hinges in the 'Help Rack' at a FLAPS that will work. Another problem is excessive wear of the shift rods that go in shifter arms on the transmission. I TIG welded the missing metal back on them to tighten them up.