Closed Cooling Anodes Model Year Range Anode Mat. Size 120/140/165 1972 - 1982 54-808112 Zinc 1-1/2 inch X 1/2 inch anode w/ 3/8 inch pipe plug 888/215/225 1972 - 1977 54-808112 Zinc 1 1/2 inch X 1/2 inch anode w/ 3/8 inch pipe plug 233/255 1973 - 1977 54-808112 Zinc 1 1/2 inch X 1/2 inch anode w/ 3/8 inch pipe plug 255/280 (G.M.) 1975 - 1977 54-808112 Zinc 1 1/2 inch X 1/2 inch anode w/ 3/8 inch pipe plug 325/350 1972 - 1976 54-808112 Zinc 1 1/2 inch X 1/2 inch anode w/ 3/8 inch pipe plug 888/215 1971 N.L.A. Zinc 1 3/4 inch X 3/8 inch anode w/ 1/4 inch pipe plug 325/350 1971 N.L.A. Zinc 1 3/4 inch X 3/8 inch anode w/ 1/4 inch pipe plug 7.3L V-8 Diesel 1993 - 1995 54-808112 Zinc 2 inch X 1/2 inch anode with 3/8 inch pipe plug 530/636 Diesel 1989 879194217 Zinc 3/4 inch X 3/4 inch anode only