This gentleman just made a pair of AR 5 tweeters new again for me. He says he can also do the same for other AR tweeters.
http://www.ebay.com/itm/192106715448?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
I used these recently in a pair of Al 130's and they sound good to me.
https://www.parts-express.com/dayton-audio-rs28f-4-1-1-8-silk-dome-tweeter--275-140