Google is your friend. There is a Yahoo Spica owners group that could help you.
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John used an Audax HD12.9D25HR on that speaker. I don't recall this tweeter using Ferro fluid. Audax still stocks the replacement coils. You can try Madisound, they don't list it, but they may have it, Falcon Acoustics in the UK list that they stock it... Then last resort is Audax.com
As far as the crossover, Johns parts were average to good for the day, He used decent coils, nice resistors for the time. This crossover used 1 electrolytic and several mylars... A cap replacement isn't too tough and you'd hear it.
I heard S. Angelus on several occasions and while it was an exceptional speaker for the price a number of years ago, I feel replacing it with something new (or even a vintage speaker of better quality) would be a better choice- they just sounded "indistinct". Even many small monitors these days get exceptional reviews while lacking just a bit of low bass- and more often than not, this is not regarded as critical on many types of music.