Good morning!

I've recently bought a set of 240 and 360 Airplex dual channel radiators used.
Currently I'm just using the 360 with the CPU heated water first entering the 30% channel before going to the GPU, then to the 70%.
This is way too little cooling, so I started preparing the 240 for install, but during pressure testing it leaks!
It cannot hold as low as 0.1 bar, while the entire loop with the 360 holds 1.5 until i stopped testing.
The O-ring for the 70% loop has been damaged by the previous owner, so it's flat.

Does anyone know which O-ringI should be buying for this 240 cooler? Ideally I'd replace both channels.

Seems to be this radiator:
https://shop.aquacomputer.de/product_inf…roducts_id=2701


Closest gasket I could find was this, but I presume this is for a single channel cooler
https://shop.aquacomputer.de/product_inf…roducts_id=2002