Aye, and a great site it is! Lots of info about DCOEs, and SU's are really simple - just can't find a great answer. I did see a chart somewhere comparing the needle diameter along the shaft.

My best bet might just be to try new ones out.

1960 Morgan +4 4 seater
1997 Nissan 240sx S14
2011 Nissan 370Z
2009 Triumph Street Triple