The adjustable spring seats are fine, but the attachment is problematic. Welding them to various components, such as the control arms could be a strengthening issue. It's really altering the component that it's being attached to, which is expressly forbidden.

Sway bars are free, but cockpit adjustable is clearly not allowed.

And while struts are free, the spindle area is gray at best in my mind. I'm not familiar enough with the spindle/strut relationship in this case to be knowedgable.