You don’t need that. The 5000 came with two different sets of rubber blocks, short and tall. I can measure them when I get home. Also where they go on the rail you can easily cut some 4x4 wood blocks to fit in there to get the added height if needed. I will take some pictures later.

The maximum lift height I find plenty high enough. The lift fits under my car with the rubber blocks in place (short ones) and my car is lowered about 1.5” inches.