AVERY P : Hi. How can I adapt this beauty dish to fit my promaster studio lights? Is there a speedring I can buy? Thank you.GRICELDA G : Hi, yes you can buy a speedring from promaster to attach the Mola Demi. I have Alien Bee and I bought a speedring for my mola Demi from them. IrisTHOMAS W : I think Promaster is compatible with Bowen's type mounts.