Pair of 10.9 Class (metric equivalent to Grade 8) hardened, yellow zinc plated flange bolts to attach the thermostat housing on 3.7L and 4.7L engines. Compatible with Jeep: 1999-2010, Grand Cherokee WJ WK, 2006-2010 Commander XK, 2002-2012 Liberty KJ KK. Replaces Mopar 6505502AA. These 10.9 Class bolts are stronger than the 9.8 Class OEM bolts that are notorious for breaking. Sold by a small business in the US.