Quote Originally Posted by peety3 View Post
Pick a softbox that does NOT have a specific mount, in other words it just has rods. Then pick the corresponding "speedring" to suit either your Einstein, one speedlight, or 1-2 speedlights. Take a look at http://profoto.com/us/products/light...dring-adaptors for one example - it allows Profoto softboxes to mount on many brands of lights, though I can't tell if the AlienBees model would work on an Einstein. This way, you just change out the speedring to suit the lights you're using, and keep the same softbox.
For me, I actually prefer the Paul C. Buff line of softboxes and octas. They don't feature interchangeable speed rings (although some of their older softboxes did). So why do I like the PCB modifiers? They're one piece and never require assembling. They simply fold up like an umbrella and then open by sliding a ring onto the "umbrella" shaft. That causes the whole softbox to spring into its shape. Then the only thing you have to do is affix the front diffuser.

I've spent so much time and experienced significant frustration assembling various standard softboxes in my life that I thoroughly enjoy this convenient and time-saving feature.

But on the point of Profoto speed rings, yes, the Alien Bees/White Lightning speed ring will fit the Einstein. They all feature the same mount.