Does Mazda have lifetime struts to narrow my strut looking choices or are there non-Mazda struts with a lifetime warranty? Vehicle 2004 (Mazda 3 sport) has 100K on original front struts and they need to be replaced. I am sure there are members who have changed theirs and I am looking for some help.
We intend to keep vehicle till the wheels fall off as they say. It's the wife's daily driver.

 

I'm guessing that the struts have been 'bad' for a while, but in any case, that's a long time for struts. I'd suggest to just get OEM ones, since they lasted well.
Make sure to check all the steering linkages, ball joints and any other connection points while the struts are being replaced. Since most of those things will require a re-alignment, you may as well do it all at once instead of needing to pay for multiple alignments.

 

Not bad for OEM. I got 83k out of mine. I would look at KONI's. They are, in my humble opinion, the best on the market. You can get the FSD series to work with your stock springs or opt for the lowering Eibach Pro-Spring Kit.