Help by finding the right KNOB'S for Nad 320 Amp.

[shaby]

Hi,
I have the NAD 302 amp'.
I miss the controls of:
*Bass.
*Balance.
*Treble.
1. Is anyone knows how can i find 3 controls for this 302 model?
2. Is anyone knows measures of the holes that the controls are get in?
3. Some other AMP' models of NAD that maiby there controls will be fit?
Thank you!

Here is the PIC of the AMP:
Nad 302 image by rvela2007 on Photobucket

My AMP (watch for the missed controls)
ìåç éã ùðéä ìåçåú øëá îëéøåú ðãìï

 

[shaby]

The amp. is NAD 302 (and not 320).
THX!