A couple of years ago I was looking for the same things. I ended up finding the linkage piece i needed at a swap meet. The bushings for the shifter were another thing. If I recall I ended up getting some that fit the shifter hole but the inner hole was too small so I drilled them out. Seems to me that they were a tad snug but they seem to work okay. I found them at a hardware store in one of those bins that have the misc fasteners and stuff. Could probably get some brass stock and turn them on a lathe too, shouldn't be too hard. Good luck.
don