Protein Skimmer Help

[Caleb1266]

Alright so I have a 160 gallon tank with built in back filtration. I need a protein skimmer to put back there but the opening in the top is only 3.5” wide, so I need a skimmer that can fit in that gap it can be wide but must be less than 3.5” deep. Any help would be appreciated

 

[Snoopy 67]

HOB --Hang on the back.

 

[Caleb1266]

HOB --Hang on the back.

HOB --Hang on the back.

Right I am more looking for a specific one that fits those dimensions.