It's too bad we can't merge these threads.
http://www.drmarine.com/proddetail.asp?prod=DR141$13.50 ea
http://www.drmarine.com/proddetail.asp?prod=DR142$12 ea
Are the original chainplates just screwed into the hull? Mine are through bolted with what looks like two 1/4-20 ss bolts, thru stainless backing plates under the lip. It's clearly not original, but I think was pieced together from non DS-specific parts by a previous owner. The top part has TWO holes, one aft of the other, but within an inch or so of each other. I had to widen them with a dremel to accept the larger pin in Rudy's upgraded shrouds.
Seasick--if I remember correctly, stays go front and back (fore and aft if you prefer) and shrouds support the mast to the sides. Those of us with limited nautical vocabulary (I include myself there) have been heard to say sidestay, so you're not the first. If you say sidestays everyone will all understand you, same as if you said mainsail rope instead of mainsheet. It'll just be hard to find in a search engine.
Luke