These are volumne spacers fiting for the Fox Float X (and other) shocks.
It's fitting tight onto the shaft, but it's working ;-)
I attached also the Fusion File so you can modify it for your needs.
The both models are the copied 0.4in³ and the 0.8in³ version.
Due the high pressure, I've printed with 4 perimeters, and bottom/top 5layers and 50% infill.
I used PETG, but I think everything should work.
The author marked this model as their own original creation.