Engine piston,
7000 Series 256 cu. in 4 cyl turbo diesel
7500 (1973 thru 1975)
7600/ 7700 (1975 thru 1980)
7600/ 7700 Series 1980 thru 1981 4 cy. 268 cu in.
7610/ 7710 Series 1981 thru 1987
Engine piston, 4000 series 3 cyl 201 cu. in.
4600 series 3 cyl 201 cu. in.
6600/ 6700 series 4 cyl 268 cu. in.
6610/ 6710 series