Unless you have bent / damaged pins, its usually not necessary to change out the card slot itself. The Supergrafx card slot is unique in its shape compared to the other systems. You might be able to make something work, but a direct replacement would have to come from another supergrafx. It may be worth checking continuity on each trace from the hucard slot pins back to wherever they go. Like steve and I said, cracked boards are rediculously common on the Supergrafx and it can sometimes be hard to find. Even a tiny crack can break a few traces but barely be visible through the solder mask. Best of luck!