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14mm Duramax Gorilla Girdle Kit (LML) The ½"� thick Gorilla Girdle is the strongest girdle on the market. It utilizes the XXL ARP 14mm main studs. This 14mm girdle only fits the LML Engines from 2011 - 2017. Core charge on the upper oil pan $250.00 Core charge is added to part price. We will credit the core charge back when we receive the old upper oil pan.