The function of that kit is to convert five different elements of the OD2 from their stock configuration to MOSFET-based alternatives. You can read the specifics in the second half of
THIS POST from my OD2 FAQ thread. Four of these work in the overdrive stage of the OD2, so would be potentially applicable to any Tube Screamer circuit clone. The fifth applies to the boost stage of the OD2 and converts it from the classic EHX Linear Power Booster circuit, which uses a standard bipolar junction transistor (BJT), to a MOSFET boost. The latter does not have as much drive as the LPB circuit, but has more top-end "sparkle", if that's how you like your boosts to sound. Refer to the
OD2 schematic to see how these conversion parts integrate with the overdrive and boost circuits.
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