I recently purchased a pair of vintage JBL's the previous owner stated equipment original to cabinet although many years earlier the le 85 drivers were sent in for new diaphragms. The horns were blue as well as the 15 inch woofer, should the le 85 drivers have been blue as well , or could they have originally been black. The mismatch in color between driver and horn makes me wonder if is was stock. If there are any authorities on this I would appreciate your thoughts. Thanks