I am having a similar problem for a coil for a 6.5 hp OHV Briggs. It is no longer available. They mention replacements and I bought one but it did not fit.
Some of the numbers discontinued are 799471, and 793352 which they claim is superseded by 591420.
But that one does not fit, the mounting screw holes do not match up.
on fleabay db electronics shows this item which looks pretty much like the original.
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The probably have the one you need too. I doubt they are real briggs but so what. As Taryl says "it ain't th space shuttle"
I have ordered one of the above. It was half the price of the Briggs superseded part. (21 vs 41 dollars US) I will report how well it works.