I am thinking of replacing the front speakers with Alpine SXE-1725s
They are advertised on ebay as Fiat Coupe replacement speakers and seem to fit but have a built in tweeter. Does that mean I will have to disable the crossover or the existing tweeters? If so where is it located thanks.
I would definitely suggest you use component speakers, since the tweeter placement is quite important. If it's placed down as in the coaxial setup, the highs will be muffled by the legs and surrounding interior. The bass & lower tones do not suffer as much from this, so that's why they're placed down there.
Thanks but I was not planning on disconnecting the existing tweeters. I understand there is just a capacitor in series with these to filter out bass and no crossover on the door speakers. If that is the case it should work but might have to reduce treble volume 3db or so.