One thing to note, the McMaster part numbers have changed.
McMaster 6294K88 (0.75") is now 6294K441 ($1.64 @ the time of this post)
McMaster 6294K64 (0.50") is now 6294K439 ($1.40 @ the time of this post)
This is for the MDS-impregnated Nylon bushings, not plain nylon. MDS being Molybnenum Disulfide, which has wear-resistant and lubricative properties. Also available in UHMW (Ultra-Heavy Molecular Weight Polyethelene) at a significant price increase ($7.00+ each.) The standard nylon ones are available only in 5-packs instead of individually, for $4.xx per 5-pack.
I just got a '98 OBS, which has a super-wobbly shifter, so I started researching a bit. Good stuff so far!