Atik Camera & Filter Wheel adaptor - Confirmation

[Budgie1]

I recently bought an Atik 428EX mono camera with the Atik EFW2. I intend to connect these to either my SkyWatcher Evostar 80ED DS Pro or my Evostar 100ED DS Pro. Both of these scopes have their dedicate 0.85 FF/FR attached and I'm looking for confirmation that I've found the correct adaptor to mate them together.

So, I need 55mm back focus from the FF/FR and, by my reckoning, the 428EX has 13mm back focus and the EFW2 is 22mm thick, which leaves about 20mm to find. 

FLO sell the Astro Essentials Esprit Adapter for Atik Cameras, which is 19.8mm and has M54 thread for the filter wheel and M48 for the FF/FR end. It says it's for the Esprit, but I wanted to confirm it will also fit the Evostar as well?

Has anyone used this setup, or can you offer alternative adaptor to use?

Thanks.

[Budgie1]

Well, I went ahead & bought the adaptor, so I hope it's what I need.