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CONVERSION SPROCK ETS PROVEN PARTS FOR POPULAR TRENCHERS. 52 For more, visit ditchwitch.com/parts-service. You don’t have to own a Ditch Witch ® trencher to get quality parts and service. Our conversion sprockets let you fit proven Ditch Witch chain and teeth to more than 70 models from Vermeer ® , Case ® , Bobcat ® , and others. You’ll get industry-leading performance on the job and outstanding service you can count on at the dealership. Put Ditch Witch expertise and experience to work for you.