Best to replace the whole radiator for the reasons above and also in that other thread. If you just replace the end tank then the rest of the radiator is still old... and fuck knows what level of corrosion may be inside, could be a ticking time bomb as even the youngest GC8's with original equipment are ten years old now.

Haha shit mine was done two years ago, not one!

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Silver GC8 | RallyArmor
"Perth WRX, home of the cynical." - TROLLEY