Per the Class rules, the location of the fittings shall not be changed:
ARTICLE OD-V: OPTIONS, ALTERATIONS AND REPLACEMENTS, 2. Blocks, eyes, cleats and fairleads associated with the mainsheet, jib sheets, spinnaker sheets, spinnaker halyard, spinnaker tack line, and jib furling arrangements may be replaced, but the location of the fittings shall not be changed. Additional cleats and blocks may be added. The spinnaker halyard block and the spinnaker halyard exit block may be replaced with a single halyard exit block.