Here's the link to Optimus 21 tweeter set on eBay (hope it works...):
http://www.ebay.com/itm/Optimus-21-Tweeters-and-Crossorvers-Speakers-/162410728298?hash=item25d06f0b6a:g:toEAAOSwiONYQAlY
--stuart
http://www.ebay.com/itm/Optimus-21-Tweeters-and-Crossorvers-Speakers-/162410728298?hash=item25d06f0b6a:g:toEAAOSwiONYQAlY
--stuart