The original Fried speaker company is no longer around. The name 'Bud Fried' was purchased a number of years ago by Jim Salk, and that web page is it. It was aimed at producing modern speakers designed using some of Bud Fried's ideas. The business model was to sell through dealers instead of internet direct, as Salk does with his own line of speakers. I don't know how successful that effort was, as I have never encountered any of these Bud Fried speakers.
I have heard one older Fried model, but not the Model B. It was a number of years ago when I heard it, but I remember liking it. It may be possible to find a replacement woofer, but I would avoid modifying or rehabing the crossovers. Exchanging old capacitors for new ones is not going to improve things unless the old capacitors are of the non-polar electrolytic type,
some of which can fail with age.
If you want to buy new speakers, I think the $500-600 per pair price range may be too low to satisfy you. In the $700-1000 per pair range are a number of excellent 2-way bookshelf speakers,
Salk SongSurround I ($895 per pair), Philharmonic Audio
Mini Philharmonitor ($695-750 per pair), Ascend Acoustics
Sierra-1 ($850-900 per pair), and the
SVS Ultra Bookshelf ($1000 per pair).
I am most familiar with the Salk speakers. But Jim Salk's long-time collaborator in speaker design, Dennis Murphy designed both the Salk and the Philharmonic Audio speakers. For that matter, Dennis also designed the speaker sold under the Bud Fried name.