I believe the advice ahead of me is your best bet.
However, if that fails, I thought of two potential solutions...
If you have the bit that broke, or even if not, you may be able to go to a welder, who may be able to re-attach that bit, or fabricate a new tab. It is kind of a long shot, and most likely not cheap, but it is a possibility.
The other idea I had was that we live in a modern age. Life can really be different than it was. The technology exists in the form of a 3D printer. There are copiers out there that will make an aluminum part that is an exact copy of the one you have. This is done two basic ways, one is using a build up technology and the other is using a cut away technology usually with electrical or laser pulses.
These 3D printers can use aluminum, so that may be a way to go. I have never tried to have a part like this made, so I cannot guess the price. I can guess it will not be cheap.
Karl I. Sagal KarlSagal@Gmail.com
Well done is better than well said. (Ben Franklin)
1988 Fleetwood Southwind, 34'