The UK quattro Network
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If you don't yet own one, beg, borrow, buy or steal a metal detector. And sweep your drive with it. 215s are precious.
ET stands for "Einpreßtiefe" - "pressed in depth".
See http://www.felge.de/tunerprogramm/technik/et-beispiel.php?step=step3 for a calculator
Fill in the calculator frame:
Altes Felgenbreite in Zoll = width of old rims in inches
Vorhandene Spurplatte in mm = current spacer in mm
Alte ET = old ET (also mm)
Neue Felgenbreite = width of new rims (in inches)
Click on "berechnen" and enjoy.