New in the box - NOS GM correct fitting rear brake wheel cylinder – P/N 2620632 and 172-625 – group number GR.4.665 – casting 5473638 – interchanges to 18020178 and W78744 – fits driver’s left rear wheel LH - factory OEM for 1971 1972 1973 1974 1975 1976 1977 1978 Chevy and GMC C/K 30 trucks and 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 Medium trucks and vans - may fit other makes and models as well – we are not 100% familiar with all items, it is up to you to verify part number and pictures against your application – dusty former collector’s inventory in new condition as shown – MISSING one side rubber dust boot