Cool, thank you. I'll try the local parts stores first.

12.18mm-ID X 17mm-OD X 18.13-W. thats .479" X .669" X .713"..

I measured some new spare ones I have atm.

BTW: you should be able to get them over the counter much cheaper than through ebay... at ~ $8

pilot bushing.

I have an early A12 engine in my Triumph Spitfire. A friend blew it up: #2 conn rod seized. As y'all know, it's cheaper to find a new used engine than to get the crank reground, replace all the bearings, get the conn rods machined, so that's what I did. I found an A14 with an automatic transmission hanging off the back (sweet, because now I have an auto bellhousing for maybe someday building a toyota or ford-based 5-speed since I cannot find a 60-series 5-speed for under $1k.) SO. I bought an Exedy clutch, and disassembled/removed the flex plate and had a heart attack when the flywheel wouldn't fit on the end of the crank, read the datsun1200 forum and found out there's a spacer on there, removed that, now the flywheel fits and the exedy clutch parts all fit: splines are right, clutch housing bolts into the flywheel.
What doesn't fit is the bronze bushing. I measure the four-speed 56-series input shaft at almost exactly 12mm in diameter, which should be the bushing's ID, and the crank recess at very close to 17mm, supposedly the bushing's OD. Well, the bushing is actually 15mm ID, 21mm OD. Not even close.

This is why I have a metal lathe and a pile of oilite bronze.

However, I'd like to know what the numbers _should_ be, particularly what outer diameter the bushing is supposed to be, preferably to a thousandth of an inch/0.02mm.

Backup plan is remove the old bushing from the old crankshaft, but man I don't want to do that if I can help it. Anyone know what size the bushing should be? I've looked at ones on ebay (http://www.ebay.com/itm/DATSUN-1200-P ... SAN-Genuine-/221286944864) and they indicate 12.10 ID, 17.00 OD, but before I get myself in trouble I figured I'd ask to make sure those are the right numbers. (and maybe I'll just buy that one.)

Thanks for any advice.