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Why do you need an aftermarket coolant tank? I guess if you really need one carry the stock one to a metal fab shop and have them weld you an aluminum one together with the same dimensions.
The metal ones will work, but they aren't fool proof. It will require you to relocate or move a few things depending on how it's made. Also keep in mind that they are only as good as their welds. Poor welds = leaks.
I would be very interested to, i just completed my m90 swap and have NO overflow bottle, which sucks having to refill by hand before I start the car every time...