Welcome. Probably your best bet is ereplacementparts.com. They seem to have an enormous inventory of parts, and exploded view diagrams to identify them. Looking around a bit, I don't see that model number, but here's a link to DeWalt 7756's instruction manual..https://www.manualslib.com/products/Dewalt-7756-3179055.html
If your eyesight is like mine, you might have misread the last number. Double check to make sure that's a final 5.