If you want a rack that looks period-correct aftermarket,
and all the VW people won't recognize as a VW item...you can get a reproduction Carter Carpac from the guy that bought the business making them.
Classic Racks . com.
Persoanlly, I buy/sell/"collect"/use the original carpacs on wagons...
but if you just want to buy a "old fashioned" rack and have it be in new condition, look at the reproductions.
Carters were the nicest aftermarket racks (I believe!) ever made back then, but they are hard to fin, and usually need restoration.
Check out his reproductions.
A wagon guy got all the patents, started making them then sold it to the currect owner, but last I knew that guy still ran it...
They are much more expensive then the rare originals, but all the metal pieces are cast from the originals, etc..

~There was a 1953(?) Suburban I saw online in Classic trucs", or something, with one of the reproduction ones recently. Looked good!
There is a Suburban on the rack guy's website under the "owners who bought" type page, too.