solitude-is-bliss

I recently acquired a pair of AR 91's that have one dead tweeter, I also have a pair of Hivi Q1R tweeters that I had planned to use for my AR 3a's but since they have working tweeters I didn't think they were worth replacing, question is has anyone tried the Hivi tweeters with any AR 9 series speakers ? And if so were there any modifications required ?