Maybe I'm missing the $300 connection or something.
I have a friend building a 16V turbo golf, he's looking for all the cool
body kits and such. He did his primary search in Performance VW, a UK based
publication.
In his search he uncovered Hella H4 lamps for the Mk1 golf(rabbit) for 12
pounds each.  I dunno the exchange rate, but that's much less than $300US.
You say, but thats not the vanagon...
I don't see what the difference is, unless these are the rectangular style.
My 85 are round and I like them that way. Anyway he says T2 H4's are 30
pounds each.  Thats 60 pounds a pair.  Probably under $100US.
Freight on these parts isn't that much, especially if one orders in bulk.
Another example is the golf grill spoiler.  Bonrath sells for +$100, a UK
source sells for 13 pounds.  I am buying a front apron for 30 pounds,(less
than the cost of one in the junkyard that I'd have to chop off), so I can
use a round headlight grill on my rabbit pickup, with my H4's.
Guess the point is, take a closer look before assuming a part should cost a
ton of money because it is superior and well known, like the Hella H4's, or
E codes? I guess.