Celestion Ditton series drivers

Recently I have noticed that ebay is selling replacement diaphragms for Celestion HF 2000 tweeters.  Has anyone had any experience with them?  Or any other way to keep the Celestions functional without altering the drivers? I have a set of Celestion Ditton 33, 44, and I just bought a set of the Ditton 66's in walnut.