In this movie they put them on:
For the normal z4 they are not included, but it uses a completely different strut obviously, strangely with linear springs unlike the z4m V3 kit which comes with progressive springs (z4m clubsport comes with linear springs though).
I had to adjust mine because I use a M3 anti-rollbar (and that may be the reason)
You can test it:
When you jack up the car, the front wheels are in full droop.
When they are in full droop, the end links may never push the anti-rollbar against the lower suspension arm (otherwise it can damage the shock when for example you hit a pothole or on the downslope of a speedbump).
So if the antirollbar hits the lower suspension arm in full droop you have to shorten the end link.
With the progressive springs you should be able to get a reasonable comfy ride. If it's too bouncy just dial back the compression stroke (and rebound accordingly)