Cookies in Cal/AZ/Nv etc, are easy to find and cheap, although now that the prices back east have skyrocketed, it is harder to get them for $75 each. Now they are readily available for $100 each.
After 12+ years of tracking on them, I have bent two or three slightly and found a half inch crack in one. Not bad for the extreme abuse that they receive.
Not many out here would spend $700 for a new set, but if they are impossible to find back east, then as long as they weigh the same and are basically the same dimensions, there should be no problem. I thought that the ones proposed last year weighed less and were possibly slightly wider.
Late Offset Phone dials are harder to find, so an alternative to them might be warranted.