The Mercruiser shift cable is a set length. They're all the same but there are two styles depending on how the cable screws into the bell housing - from the front or from the back. Front-side (boat-side old style) mounting can be converted to newer style drive-side mounting by rethreading the hole from the other direction with a 1/4 npt pipe thread tap. Cables come in a set with all the needed parts to install except for the boot that seals the hole in the transom, that will have to be purchased separately.