I have an Iseki 1910 and what I did was measure the diameter of the frost plugs on the lower portion of the block with a caliper as the plugs are slightly recesed.Then I went to a local auto parts store and bought a couple of spare frost plugs in case the block heater didnt fit.Then I went to a local ford/nh dealer and he found me a block heater that fit a 1.75 inch plug.Im sure yours has different size plugs but mine were all 1.25 or 1.75 inches works great its well worth the effort.