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The standard electronic unit for mounting is 19" wide on the front plate. Behind the plate the remainder of the unit has to be less wide as to slide in between the posts. This width tends to be 16The standard electronic unit for mounting is 19" wide on the front plate. Behind the plate the remainder of the unit has to be less wide as to slide in between the posts. This width tends to be 16½ wide.* 16½" Equipment case chassis width* 19" Equipment front plate width