Some suitable aluminum Bumper I could find, but the reception at the Alpha degrade somewhat and also like to scratch easily the metal rim. The Spigen Neo Hybrid Case also fits, but wearing too much to me.
Therefore I have given this Flipcase a chance because it replaces the battery cover and therefore not as thick as other flip cases. And in fact, the case is pleasing slender, also very well made and looks chic. On top of that, it fits easily with the thicker battery. The cutout for the rear camera is also minimal forth, so that the lens etc. no contact with table surfaces gets when used on the Alpha.
The front closes well and keeps, even without any magnet or closures.
So all in all, a very good, chic case. Highly recommended.
I must now get used only to the constant opening and closing: P