Just remove the EGR body, measure the openings of the 2 holes and make yourself 2 block off plates about 3/8" of an inch thick. Don't forget the tube block off as well, I made the round block off plate 3/16" thick as I found that the retainer clip on the tube isn't big/wide enough to fit the 3/8" block off plate I originaly made. As mentionned above, MADS web site has all the step by steps.