You can also repair the originals. Both my dash tweeters were blown and I did a lot of searching as well.
I chose to fix them. Cut around the edge of the protective cover(very carefully). I found that the speaker worked perfectly and the outer edge(the foamy flexible part) was torn. I simply put a bead of silicon caulking around the entire edge, not too much, but enough. I then put the protective cover back on while it was wet, helping to secure and strengthen it.
It's been 2 years now and finally 1 of them has given out. The other is still going strong. I like the bass up high too...