the lights i chose should look like they are supposed to be there.
Hella part # 2ZR 001 409-071.
HELLA Rückfahr-Scheinwerfer
116x55mm Lichtaustritt, Kunststoff, chrom,
mit M8 Befestigungsschraube
found some made by Hella on ebay, but they look like they are available from VW parts houses as 67-69 ghia backup lights.
--Steve