I've got one of those black plastic rain shields for late Beetle deck lids. They divert water away from your engine, but still allow air to enter.
Here's a bad pic:
http://store.cip1.com/Merchant2/merchant.m...ode=02-06-03-04You'll pay $57 at CIP, $20 takes mine. Its in perfect condition, no cracks, all hardware there. Heck, I'll even install it for you!