Lots of usable info in this thread regarding Rudge-style wheels:
http://www.356registry.com/forum/viewtopic.php?t=6677
Some neat alternatives to get the look without spending the coin. Maybe some of the low-tech will help you, or others, out.
For the wide five Rudge-style, it's pretty much go wheel skinz with a center spinner or go home.
I took a journey down cellar and grabbed up a few fast items that might work (with some work) for the four lug wheels. Just a quick poke yielded these. Excuse the lack of paint and the junky four lug prop wheel, I just don't have many four lug VW wheels around that aren't already on cars.
First up, my sad, shabby rim,
http://img.photobucket.com/albums/v136/TeamEvil/center7.jpg
This is the basic lens from a blinking "road closure" saw horse/blinking light unit. They're available at every bridge collapse in your local area. Easy to steal and you only need two. Bring beer and a Buddy, makes for a fun "boy's night out." Of course the lens would need to be painted silver or wheel color.
http://img.photobucket.com/albums/v136/TeamEvil/center6.jpg
Add a spinner, three or four prong and it's looking pretty neat.
http://img.photobucket.com/albums/v136/TeamEvil/center8.jpg
http://img.photobucket.com/albums/v136/TeamEvil/center1.jpg
Those 80's style ARE aluminum center caps are available on Ebay or at every auto jumble on the East Coast for free.
http://img.photobucket.com/albums/v136/TeamEvil/center3.jpg
Add a two or three blade spinner, and it starting to get real.
http://img.photobucket.com/albums/v136/TeamEvil/center5.jpg
http://img.photobucket.com/albums/v136/TeamEvil/center9.jpg
Got an old set of Volvo caps, could work as well if you hammer out the lettering. They have a neat domed profile.
http://img.photobucket.com/albums/v136/TeamEvil/center4.jpg
Maybe?
Just saying . . .
ForuM PRicK