Lever shocks are quite a heavy duty unit. They are "relatively" soft shock, what do you expect from a Buick. The places they can leak are the shaft seals, they are an ordinary seal available anywhere. From the end caps, a heavy gasket seal suitable for pressure. From the Bottom plug, a flat plate type plug, not unlike a frost plug, but flat.
If they have been run dry for very long, the cylinder could be scored and you may need to find another. I don't know if rebuilders sleave damaged cylinders. They are a slip fit to the pistons and do not use a seal so fit and amount of scoring is important.
If you lower by cutting the springs, you will probably run into the same problems anyone else does. You will not have as much travel in the suspension when you hit a bump before the suspension bottoms.
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