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Message: <blockquote data-quote="Tin Man" data-source="post: 512884" data-attributes="member: 7021">Thanks for the suggestions.  Since the two original transom holes that were for the transducer that came with boat matched my new bracket, I decided not to add a HDPE sacrificial mounting plate.  Instead, I used a 1/8"x2"x3" piece of ABS plastic between ss mounting bracket and hull.  Used Boat Life Polysulfide as sealant.If transducer height is not correct after a water test, I may have to add a piece of HDPE for increased height/drop adjustment.  If I do, I'll make a piece small enough where I can still use the two holes already in transom and screw HDPE using those two holes.</blockquote>