Try this. Get a 1/4 in bolt maybe 2 1/2 in to 3 in long. Put on a flat washer. Put on the new bushing (put a little grease on the bushing). Put bolt through the shifter arm (at shift lever or at the trans). Then a 3/8 drive short socket just large enough that the bushing can fit down inside (square drive side out), another flat washer and then a nut. Get everything lined up and tighten the nut. The bushing will be pressed into the arm. I have done this many times and it works every time.

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84 500 SEL (307,xxx miles)