854 Kohler K181 fuel line question

Does anyone know the size (3/8, 5/16, ect) of the hard fuel line that runs from the fuel pump to the carb on the Kohler K181 on my 854. Mine was gone when i restored the tractor four years ago and I used a length of flexible fuel line in its place. But now I want to try and get as original as possible, with the exception of the seat.

I have a few 7, 10, and 12 HP's sitting around here and they are all 3/16" OD. I would think it may be the same.

Thanks, that will work.