Classic engraved 4x4 shifter knobAluminum7/16"-20 threadedCompatible with 1971-1980 GM K series full-size trucks w/ NP205Compatible with + K30 to 1991 (only model to retain NP205)Does NOT appear to fit earlier years (smaller thread - confirm size)WARNING: GM changed from 3/8" to 7/16" thread around 1971Does NOT FIT newer models (different pattern or thread size)