PERFORMANCE OIL SEAL.A "T" at the end of the part number indicates a Teflon seal.Size: 30 x 72/76 x 8/10.R = ribs on outside of oil seal.T = tips on oil seal.F = flange on oil sealDC = double lip, double spring, rubber.TC = double lip, single spring, rubber.TB = double lip, single spring, steel.