DIY, Marion!
Marion,
The part numbers of the gaskets that will work for you are as follows:
00-064225 and 00-070992.
While your machine may still be in useable condition, all the parts for it that were related to its Hobart commercial cousin were obsoleted way back in 1994.
Any parts that were still available slowly dwindled down to zero at the Hobart distribution center.So, the only thing you can do is basically make yourself new gaskets out of thin cork gasket material.
If you carefully support the motor from falling out of the machine, you can remove the bolts that hold it to the tank and remove the metal plate inside the tank and trace out a new gasket and then reinstall the plate with the gasket between it and the tank. That should fix the problem.
You may want to try tightening the screws up first and that may seal the leak for another 50 years!
Make sure that you use a number 3 Philips head screwdriver, or at least a very good number 2 screwdriver, so that you can get a good tight fit on the screw heads and not strip them out. You may also have to use an impact driver to loosen them too. Not an electrical impact drill driver but a hand held, hammer actuated driver. That's how we used to get those screws out when those machines were plentiful.
I will email you the parts catalog for reference. I already checked ebay for the gaskets and did not have any luck. Maybe some of the members here may have them available and they would chime in if they do.