RJ-9452K47 - O-Ring (2 1/4 in. OD x 1 7/8 in. ID x 3/16 in.)

2 1/4 in. OD x 1 7/8 in. ID x 3/16 in. black rubber O-ring.
Most commonly found in our RJ-600003-101 JL/JT/JK Front Spring Tower Plug Kit.