HD Guide Upgrade for Four Corner Lifts Add PVC guide poles to your Four Corner Lift with our HD Guide upgrade, providing the same convenient location markers found on Front Mount lifts. These durable PVC poles help you easily identify your lift’s position underwater when lowered, simplifying boat alignment and operation. The HD Guides are also required to install padded bumper guards on Four Corner Lifts, allowing you to customize your lift for added protection and style.