Hi Joe, The backing plates were the same size as the stanchion bases. They were mounted with 4 SS 1/4" bolts. I would go much larger, as space permits. Enjoy your turkey day too! Bones ____________________________________________________________ Wholesale Hardwood Floors Never pay retail again. Wholesale prices on all hardwood flooring! http://thirdpartyoffers.juno.com/TGL2141/c?cp=-u-JIIIn0BKF-scqEvbQlQAAJ1ApMe...