Hi morhua,
Can you be a bit more specific in what you are looking for?
Generally, any small shackle will do for attaching halyards to sails - there are many types to choose from, as well as a myriad of ways to attach said shackle to the halyard ...
The mainsail attaches to the boom via a boltrope run into a slot in the boom. Are you asking about outhaul options?
Other good sources for "small boat stuff" include, but are not limited to:
http://www.duckworksbbs.comhttp://www.apsltd.comhttp://www.sailrite.com (more for fabrics/etc. rather than hardware)
However, do not discount D&R marine. If you do not find what you need on their site, never hesitate to call them. Rudy is the "Daysailer Guru", and can probably answer any ??? you have ...