This engine has a shaft size 3/4" x 1-1/4". The original engine is no longer available. You can check out the newer OHV style engines to see if they might work for you. Please note the mounting should be the same, but due to the overhead valve configuration, the engine is 2" wider to the right side as you are looking at the shaft. You may be able to use the engines listed here with a longer shaft, but you would need to cut the shaft down or move the pulley down the shaft.
