[Tamlin]

Hi stiney,
I don't really know much about Illustrator, so sorry if this is a dumb answer, but how would it be if you opened up a "metal" gradient in the gradient editor in Photoshop and then manually duplicated the settings in the gradient editor in Illustrator? From what I've seen, the gradient editors seem to work in pretty much the same way. I know this would be a bit laborious, but it might work.

Attached is a ZIP file containing two metallic gradients for Photoshop to get you started.