I needed a longer shock spacer for my Mojave 4s and so I made some in Tinkercad in a bunch of different sizes. Spacers have the exact same width and inner diameter as stock, but with assorted heights to tune your suspension.

There is also a customizable version that is 100mm tall. This means that you can use the scaling tool in your slicer to get the exact height you want (for example, Z = 11% would give you a spacer 11mm tall.