I pulled the guts out of my Pilot ANRs and fixed them into my Alpha. Excellent result but not a quiet as Sennheiser ANRs which are even better.
The ear cups in my Alpha are quite shallow and I couldn't get the Sennheisers in.
I couldn't put bigger cups in the Alpha and get it on my fat head.
edit just to add that the rechargable battery of the Pilot headset fits inside the Alpha cup.
