Your master cylinder number doesn't seem right, but the numbers/letters in the casting can be hard to read, especially as the tooling gets older. The end of your number is the most critical. I think your "80" on the end may be a "BD" instead...
The 2 most common are 113.611.015.BD
and 113.611.015.BDD (note the second "D")
The latter is for 4 wheel disc brakes and is a 21mm bore cylinder. The former (with one "D") is a standard 19mm cylinder and made for front discs/rear drums. It WILL work somewhat on a 4 wheel disc system, but pedal height is low and pedal feel is spongy.