Quoted from RonSS:
Turns out the new one only has 2 prongs. So I lucked out.
I've read you can take the 3rd prong out, or connect the ground to a "ground" in the cabinet, but as of now this process is above my pay grade.
Do a search, I've found it before, just can't remember where.
Maybe someone here can post a link.
Attach the ground wire to the frame of the transformer. You could use a ring terminal that costs 50 cents and undo one of the screws holding down the transformer and put it under the screw or just solder it. Some guys are die hard purists and will stick with two prong cords. I could care less either way as long as it’s safe.