I looked for some time and this was the smallest. It's tight as you can see but fits in the back corner. It sticks out pretty far from the glass too btw.
The Amazon link has dimensions. I also use the Jardli diffuser and outflow. From what I can tell so far quality is good for the price. I couldnt get rid of scum without it unless I took the outflow out of the water. Surface is spotless now!
Got from Amazon. I'm liking the size for the shallow tank.
JARDLI Glass Lily Pipe Inflow with Surface Skimmer for Aquarium Planted Tank (13mm for 12/16mm (1/2'' i.d.) tubing) https://www.amazon.com/dp/B01LZ2DV9W/ref=cm_sw_r_cp_apa_i_vnWZCb1GWMSHG
Looks really good! Did you know there's an intake with a built in skimmer? Would eliminate the big Eheim skimmer. https://www.amazon.com/JARDLI-Surface-Skimmer-Aquarium-Planted/dp/B01LZ2DV9W
Tank: https://www.marinedepot.com/aquamaxx-long-cuboid-low-iron-rimless-aquarium-9-1-gallon
Inlet: JARDLI Glass Lily Pipe Inflow with Surface Skimmer for Aquarium Planted Tank (13mm for 12/16mm (1/2'' i.d.) tubing) https://www.amazon.com/dp/B01LZ2DV9W/ref=cm_sw_r_cp_apa_i_wDzzDb0HCMQJQ
It's barely fits. It basically touches the glass on the bottom and the bend sits about 3 inches over the glass. Also had to cut part of the inner piece off to shorten it so it wouldn't restrict the flow if the water evaporated.
That canister filter has different sized inflow (leading into the pump, away from the tank) vs outflow (leading out of the pump, towards the tank. I have the same one.
The inflow is a pretty common size, the size you're looking for is 13mm for 12/16mm (1/2'') tubing. This is widely available both in premium brands and value brands. You can look at the aqua forest aquarium site in the sidebar, labeled Aqua Design Amano, or GLA labeled Green Leaf Aquariums in the sidebar, or find them on amazon, JARDLI being a common 'value' product creator on there.
The outflow is less common, you're looking for 10mm for 9/12mm (3/8") tubing. This is less available-- GLA does not carry this size afaik. Aqua Forest Aquarium and JARDLI do carry it, but your selection may be somewhat limited.
I use this inflow and this outflow. That outflow will not work with a rimmed tank, I was just providing it as an example. The inflow is big enough to fit over a rim, but its surface skimming action can be a bit risky (tough to get the floating level right, if you do it wrong it won't skim and if you do it very wrong it will pull bubbles into your pump)-- so take some time to look at your options before springing for one.
See my other reply, it basically just cuts the crud that floats on top of the water.
https://www.amazon.com/Inflow-Surface-Skimmer-Aquarium-Planted/dp/B01LZ2DV9W
you should be able to hook this right up to the 2215: https://www.amazon.com/dp/B01LZ2DV9W?psc=1