I love my new L3301, however while bush hogging, my arms get tired and don't like to just flop arm on back fender. I called my dealer and they stated that Kubota doesn't offer armrest kit for this model. So, I happen to have my Snapper Zero Turn mower on my trailer and remembered that I had ordered the optional armrest kit when I purchased last year. I took off the sear armrest bracket what do you know, and exact fit!!!! I traced down the part number and Snapper part number is 1687810YP, $80. I also think this product is made by K&M manufacturing, also can see kit on TractorSeats.com. Really made a big difference when on tractor for extended periods of bush hogging. This mounts very easy, you will see small drill hole indications on side of seat, 3 per side, the kit has bracket, armrest and these metal tabs which slide on the side of seat where you screw bracket to plastic back part to firmly mount.