I no longer make LeverLifts and the company no longer exists. I am not selling parts nor will I reveal my source for the gas springs, nor their specs.
There is a whole lot more to the selecting the proper gas springs than just taking a pair off of another brand of tonneau cover??? The gas springs I used were based on an engineering formula that requires knowing the weight to be lifted, the center of gravity of cover, the height to be lifted, the extended and compressed gas spring length, and the angle that the spring will be mounted determines how much gas spring pressure is required to lift the cover. As little as 1/4 inch error in mounting the gas spring can mean that the gas spring cannot lift the weight. Too much pressure and you can rip the mounts out and permanently damage your cover or your truck bed.
I am recently retired, and if my finances start to go south or I run out of things to do and get bored, I might consider reviving the company. But until then the LeverLift company is closed.
...Rich