Have 2 extra L-pad speaker switches for volume control 15 watt, 8 ohm, 3/8 inch shaft mono speaker. Part # 260-248 on parts express. $6 each plus shipping in USA.
Have 4 extra 500 ohm 1/4 inch shaft potentiometers. Part # 023-500 on parts express. $2 each plus shipping in USA.

Thank you.