I took off my snorkus to remove my headlight to replace a side bulb. I noticed some white / greenish corrosion at the top corner of the radiator at the plastic / metal junciton. I assume this is the beginning of a crack / leak. My questions regarding replacement are my options. Does anyone recommend an aftermarket radiator? How much more will an all aluminum one be? Is there an advantage to get the OEM one? Also, I am guessing this is a straight forward job. Anyone who has done this are there any tricks?