PLEASE NOTE: These knobs are used on all current full-sized graphic EQ's (except M9 Carbine). They are also the direct replacement for all older graphic EQ knobs on such amps as Mark II's, Mark III's and Mark IV's. However, the older knobs had a much more rectangular shape with right angles where these are more rounded around the edges. So, if you are looking to replace one or two on your older Boogie you may consider purchasing a full set of 5 to ensure they all match.
KNOBS USED ON: Mark Series Amps (except JP-2C which uses Part# 408580) Express Plus Series Amps Boogie 5 Band Graphic EQ Nomad 100 50 Caliber + 22 Caliber + DC Series (except DC2) Quad Pre Studio Pre