For future reference if anyone else runs into this problem:

The Fat Black Rubber Band rests on the smooth sides around the cluster, with the folded edges standing up. The notches on the top line up with the white light cones, and 90% "lip" (or folded edge) of the Band sticking straight out on the driver's (not engine) side of the cluster. This lip helps hold the cluster in place in the dash.

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Henry Bofinger
1989 560 SEL (black/black)
2001 Audi TT Roadster (silver/grey)