Been looking myself for info opn the boat, the best source I have found is baker boat works, who sells the plans for the sprite,
www.by-the-sea.com/bakerboatworks/
it's listed as the spirit, download the PDF and it explains that it was designed for O'day, and 3500 were built.
Have thought of buying the plans, but $39.00 is a touch steep in my mind to check
rigging etc.
Supersprite:
I have the mast and boom in the garage, If you still need the measurements I'll mtake them for you, been rainy here so I'd have to hold up on measuring the sails.
Ken.