I contacted SPAX recently, and they can still supply you one I think. Otherwise try CAV directly?
Also know a lot of people went other brands on the CAV, just have a set made up?
There's also GAZ shocks. I replaced my leaky Spax with GAZ.
After contact with GAZ they custom made me two coilovers to the Spax dimensions to suit my KVA. https://www.gazshocks.com/