[Jeff_H]

I would guess that the spars on a Coronado might have been either Kenyon or Dwyer both of which are still in business and both have websites with thier various products.

Dwyer
http://www.dwyermast.com/dwyer.htm

Kenyon
http://www.rigrite.com/kenyon/kenyon.html#replacement spars
http://www.kenyonmarine.com/marine/medit.html

Jeff