K series were pre ROPS, so no factory mounts.
So even if the machine is a L from the time about the K and L swap from looking at pictures of machines with the rops and the factory mount the factory mount doesn't look like it just bolts on to me. The picture I was looking at the mount went down the machine on the inside of the tracks and I couldn't tell how it attached looking at pic. So in other words if it doesn't have the factory mount this is not something easy like finding a rops and just bolting it on....