P7221 UNIVERSAL LOWER LINK PIN 7/8" x 4 1/2" FOR TRACTORSOne New Aftermarket Replacement Universal Lower Link Pin for Tractors 7 8" x 4 1 2" This aftermarket replacement lower link pin is a standard Category 1 three point hitch component used to connect implements to the rear lift arms of compact and utility tractors. The 7 8" pin diameter matches the Category 1 specification, making it a universal fit for a wide range of tractor brands and models equipped with Category 1 three point hitches. Specifications