Marlin 336: How hard to find a square-back lever.

[Big Paulie]

Dear Guys,

   I am looking at a great old Marlin 336, with the straight grip stock. But, it has a lever which is round at the end.  I know that a few Marlin 336s were made with square back levers.

   Any idea of how hard it would be to find a square back lever to substitute on the rifle?   The square back lever gives it a much crisper look, like the 1894 model.

Thanks for any info or experience.

Big Paulie