Matt,
Are the spreaders for a Mozzie ?
I got my Mozzie Spreaders from Goolwa Masts. They were a welded aluminium alloy assembly (no adjustment) but 3 sets of holes for the diamond wires. From memory they weren't too expensive.
See the mast fittings thread for further details. <img src="http://www.catsailor.com/forums/images/graemlins/wink.gif" alt="" />
Regards,
Peter