API 500 6B 6-slot 500 Series Lunchbox

(Pair) Harrison Audio MR3eq 500 Series 3-band Parametric EQ

API Select SV14 | 500 Series Parametric 4-band EQ

DBX 530 Parametric Equalizer Module EQ for 500-Series Rack slighty used PAIR

Solid State Logic 611EQ 500 Series Parametric Equalizer

SSL UVEQ UltraViolet Fusion 500 Series 4-Band Stereo Equalizer Module

Rupert Neve Designs 535 500 Series Diode Bridge Compressor Excellent

Shure Sr 107 PARAMETRIC EQ