Neuspeed used to use H&R springs

Comptech used to use Eibachs (questionable?)

Porsche uses Brembo brakes. Ferrari used Eibachs.

It's all the same. They just have it made by someone who can and then put their name on it. It's just the name you're paying for anyway. You can go to eibach and make your own spring and forget to put the sticker on, but would that not be an Eibach spring?