Our kicker/vang upgrades are a simple way of enhancing performance and ease of use, the upgrade is available with an SK78 or higher spec SK99 primary and a choice of secondary lines. If you want more information on our secondary lines and how to select which is best for you read our article on selecting secondary lines. All our systems are supplied with full colour installation instructions. All upgrades are for use with the Harken lower assembly. If you are unclear as to which assembly you have, or want an upgrade for the Allen system please read this guide.