For this particular car, you can get a Radtech radiator which is OEM (made by Behr I believe) for about $300 online. It seems to be the same as the original radiator. I put one of these in and it was externally and weight-wise identifical to the original-- heavy metal construction, very solid, fits perfectly, etc. To put an end to this mystery, you might buy one online and put it in.

I posted some DIY notes on changing the radiator under one of my mosts, you can find it by doing a search on all of my posts.