driveshaft questions

[roadranger]

I see some of you guys are building your trucks with traxxas stamped drive shafts with the steel yokes. Got some questions;

1. do the shafts come ONLY in standard lengths to fit the Traxxas products??
or do they come over-length and you cut them down to size?

2. the steel yokes are made by WHO?

3. are there part numbers available?

4. WHERE can I order these on the internet?

My local hobby shop sucks at carrying any of these items...

Any help is appreciated!