I don't know much, but I have an abs cartridge for a snap-on MT2500 scanner. I bought it as it is supposed to be specifically for the early GM 3 channel ABS system. I could send the cartridge if you know anyone with a MT2500 you could borrow the scanner from. The best is if you know some one with a Tech 1 or 1A or even a Master Tech machine.
sorry that's all I can contribute.
Tom