A little help with gas sending unit

So I just got a few things in the mail from a Mac's auto. The gas tank sending unit float arm needs to be cut and bent. Not sure what unit of measurement they're using on the chart. My tank depth is 6.5". For that the cut length should be 4.96, with a bend at 4.20. Anyone know what that is on a tape measure?

 

corrected:

4-31/32", and 4-13/64" should be pretty close.

 

Thanks RustyBolts its in!