Low Frequency Equalizer Unit for Infinity RS-2b (IIB) speakers

I own a pair of Infinity RS-2b speakers. They are in very good condition. The polypropylene woofers/foam surrounds have been replaced with graphite woofers and "rubberized" surrounds. The original woofers and surrounds were failing after 15 years and the replacements were superior to what I had. The new woofers were made by a technician recommended by Infinity. Additionally, these speakers came with a low frequency equalizer which was irreparably damaged in a move. I used the speakers for years w/o the equalizer and was very impressed by the overall tonal quality of the speakers...without the equalizer.

I want to sell these speakers and have someone interested, but they also want the equalizer. Does anyone have one to sell at a reasonable price? Can you recommend an alternative solution?