Van Zweeden in the Netherlands also sells a fiberglass left-rear cutout for the narrowbody cars. Even at current exchange rates it's a bit less expensive than the FVD part.

http://v-zweeden.com/shopping_cart.p...roducts_id=493

FYI - they are also selling an original bolt-in Matter (factory) cage which I believe was an option on the RS Basic/Lightweight.
http://v-zweeden.com/product_info.php?products_id=2859

 

Anyone got a part number for the lightweight bumper cutout piece?

 

The lightweight was not a true factory production vehicle, it was essentially custom-built for a handful of customers. There is no part number for the cutout.

You will need to purchase an aftermarket piece.

 

I have one for sale... let me post it on the For Sale thread... FVD unit, never installed.