Return pump replacement

[Sara’n’SWMO]

Hello! I am a new aquascaper! I have a 20 gal AIO made by Tideline. My return pump quit working and I am having a hard time finding the same one to replace it. Help?
I got one replacement and it won’t fit in the return pump compartment on the tank. I had to buy another (external) filter to have on my rimless tank for now and it looks so bad! Ideas? Picture of pump I am trying to replace is attached.
Thanks in advance! Sara

 

[Quietman]

Can you measure the return compartment? Sicce makes very small but powerful pumps (up to 168 gph) that I've used for replacements in my AIOs. Plus they come with the Sicce quality which is hard to beat. You can find accurate dimension on the BRS website.

Good luck!