I believe it is 1 3/4" of an inch off the bottom, this leaves about 1/2" - 5/8" on the lower horizontal member. I would apply two layers of masking tape mark it and cut about 1/8" from the line with a dremel tool and then belt sand to the line. I bought mine from the dude on Ebay, that way if he cracks or chips it, it is his dime not mine.