There are a pair of original L-100 foam grills on e-Bay:
http://cgi.ebay.com/ws/eBayISAPI.dll...category=14993
By looking at the cutout on the rear they appear to be from the pre-century version of the L-100 when the drivers were in vertical alignment. This would make these fairly old indeed.
Has anyone seen original JBL foam grills that are still in one piece and not a pile of dust?
I wonder if their location in New Mexico has something to do with their survival?