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You can get it from just about anywhere, pelicanparts.com has em bimmerparts bimmerzone or any of the other bimmer part sites. I found $150 to be about the average I think...and being "BMW" in this case doesn't mean its better, the BMW radiator is crap, aftermarket is actually better because that piece thats leaking now, is alot thicker on the aftermarket ones. If you plan on doing this yourself, let me know and i'll send you a few tips...and dont buy a fan removal tool, you can rent one for free at autozone. asherenian@yahoo.com

if the nipple you are talking about is the one that connected the resivoir to the top of the radiator, i believe you can purchase that seperately.

I think he is talking about the neck on the upper driver side where the large hose connects. I just broke mine this weekend as well and you need to replace the entire radiator.

150-200 is about what I would expect for price. Plus I would replace your water pump, t-stat, t-stat housing and hoses if they are old.

Aftermarket is nice, but very expensive.

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take back that autozone t-stat and buy one from the stealer or online for like 25 and get a real one.

88 and 93 are the stock temps in Celius.