Repair and restore: Fender 0174 genuine replacement parts. Fender offers a wide selection of control knobs for new and classic amps. This 4-pack includes black skirted knobs numbered 1-10 with a silver top. They fit amp pots with a solid D-axis (the flat side must be at the 12 o'clock position when the knob is turned down) and have a diameter of 7/8 inch. Suitable for Cyber-Champ, Princeton 65/65 DSP/650, Acoustasonic Jr., Super Bassman (year of manufacture 2012), and Super-Champ XD amps from the year of manufacture 1999.