Coolant Tank leak, aftermarket replacement?

[Mark-It-Zero]

Coolant light came on today, and found a slow leak on the middle part of the coolant expansion tank with faint trailing down the side of the tank.

It's an 2013 X1 35i with just under 70k miles, which in searching seem to find other owners of similar having issues with build quality of the tank.

I'm looking to likely also replace the radiator while I'm at it, since will have the opportunity to but want to ask for recommendations on aftermarket expansion tank and radiator.
Til replacement, will likely be doing the similar routine of checking coolant and topping up unless it gets worse where will just immediately replace the tank for OEM.

[Mark-It-Zero]

Just to be on the safe side and because my search on coolant expansion tanks yielding little selection, already bought an OEM replacement that will research again should it fail again.

Would like to know if there's an all aluminum option for radiator available, CSF seems to make but can't tell what's compatible. Anyone got an idea?
https://csfrace.com/product/direct-f...oling-systems/