I'm attempting to restore 2 sets of ADS L810 speakers, and have come across something unexpected. There are at least 2 different speakers that ADS installed that were both labelled as 206-0317. Neither of my sets have 100% original woofers, so I'd just like to know what belongs where! One pair has black cloth grills (earlier?), and one pair has perforated metal grills (later?). I've attached some photos so you can see what I'm talking about.