GreenBean

[smcv]

I know what a 500K potentiometer is, but what is a 500KA ( What does the A stand for ).
Also what is the W for in the 20KW pot.
These should be right angle pcb mount?

[gtr2]

They are tapers.  Here is some good reading on the subject.

http://www.beavisaudio.com/techpages/Pots/
http://sound.westhost.com/pots.htm
http://www.geofex.com/article_folders/potsecrets/potscret.htm

Yes you can use 16mm Right Angle Pots

Josh