The supertone is aluminium with chrome plate on top, I don't think they offer the supertones in nickel. Even the two points are not available in nickel. I lined up the supertone along with the nickel parts on a '63 EB0F, to replace a retrofitted 3 point. It did not work for me, both because of the chrome not matching the worn nickel of the pickup cover and because of the sheer size of that thing. I ended up biting the sour apple and bought a '62 bar bridge in good shape, costly but perfect.
Usually when matching new chrome parts with old nickel parts, I just strip off the chrome with hydrochloric acid. There is almost always nickel under chrome, the acid only removes chrome and leaves beautiful nickel unspoiled.
However as the bridge is aluminium, you can't do that. But I think you can reverse-electro-plate it, althoug it's complicated. I guess it's easier just buying chrome covers for the pickups.