I've now run into this same issue. Neither of my local euro jobber guys can get me 1, and it's NLA from the dealer. I can't bring myself to spend $700usd on a Wizard rad (i'm sure they're excellent, but my SDL needs a bunch of other work also..). I've emailed the guys at $220 as their rad is showing that it's not available.

Anyone else have any other ideas?

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2015 GTI
1991 350SDL with a clean body and a bunch of miles.
1984 190D with an AMG 3.6