HJ: "Not really. In those days some manufacturers, such a Kohler, DID make tubs with oversized holes, BUT they still used 1 1/2" drains, the fittings at the tubs were just larger. I DO KNOW, because there is absolutely NO REASON for any company to produce a 2" drain assembly. What did you want me to say? "I appreciate your problem, and if I EVER find someone who makes such an item, I will refer them to you?" The Internet may be "wonderful", but it is not a miracle worker. My answer was the same as if you had asked for a 4" sink strainer for an old Kohler sink. If that had been the case, you would also be out of luck. Manufacturers ONLY make things they can sell, and sell a lot of. As my economics professor once said, companies are NOT in the business of making things. They are in the business of making money, and to do THAT, they make things."
I guess I would be the SECOND idiot in the world that needs to replace a 1940 era tub drain (I would have bet money they built more than two homes in the world in the year 1940) so me and Husky Dad are slowly starting to create a new 2" tub drain market. I have a 1940 tub drain I need to replace also. The tub is still in great condition but just trying to "update" it a little. I am not a plumber, much less a master plumber, so I guess I didn't think that my tub drain was so unique. The reason I joined this forum was to get some useful assistance from master plumbers. I think "HJ" needs to also caveat his forum entries with "Master Heckler".