I bought the strips from a UK Ebay shop:
http://stores.ebay.co.uk/Quality-Car-Accessories
The product is a Chrome Styling Strip although they sell the same item for use on different cars. The strip is 7mm wide (just right for the grill slats), slightly convex and comes in a roll 3m long. The front is metalic and the strip is easily cut with scissors or a knife. Kimg9582 is spot on with how to fit the strips - cut at an angle to minimise any gap between the strip and the chrome frame.

I did see the American Ebayer selling strips specifically for the E70. I don't know if the product is basically the same or different in any way.

Glad the majority agrees with me on this cheap and simple mod.

Simon