Just spotted wisps of steam & a few drops of coolant, and when I looked closer I discovered a pinhole in the plastic tank down the driver's side of the radiator. (The car didn't overheat or anything - it's a very small leak and I discovered it about 1km from home.)

Is that a replaceable part, or will I need a whole new radiator including the tank?

I have 5L of subaru coolant and new top and bottom silicone hoses, and was intending to swap them over so digging the radiator out for repairs is something I can manage. I don't even need to use the car - we have three of the things hanging around.

Just wondering whether it's better to try and find a new replacement for the whole thing, a (hopefully) working 2nd hand one, or just the part of the tank which has the tiny hole in it.

It's an MY99 WRX.

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Classic WRX all the way ...