Stern light base only, all Nautiques from 2001 to now (except for boats with towers that have the all-around light mounted on the tower). Note manufacture has change the style of the cover and the locking slide- see pictures. Same size and mounting holes. Just a slightly different look. The new bases use a threaded collar to lock the pole to the base. If your old pole's collar has a smooth jam in type, this base will fit, it just won't be as secure and could work loose. You can chose to order the base with a new locking collar and swap out the old collar on your pole for the newer threaded style.