Durable and Precision-Engineered: Experience top-notch quality with high-quality supports that are meticulously designed to last and meet or exceed OEM specifications High Quality Supports, designed to last, and meet or exceed OEM specifications Compatible with the following OEM Numbers: u-fb120ss Finding Correct Support: To find the right strength for your lid, weigh it using a 2x4 board or other vertical support to hold the lid open. Place the board halfway between the hinge and the front edge, where the support will attach to the lid. Then, place a scale on the ground under the board. Multiply by 1.5 the weight that the scale reads for an estimation of the force support youll need. If unsure, please contact us Quality & Efficiency: We provide lift supports for a variety of weights in both individual units and multi-packs. For example, if your lid weighs 100 lbs., then you will most likely need two (2) 150-lbs lift supports (Do not combine the pressure of the 2 supports). This listing includes 2 Universal Lift Supports designed for optimal functionality. Again, if unsure, please contact us and we can help with clarification