Yes. Class rule C.7.2 applies to the spars, which may not be replaced unless lost or damaged beyond repair, and does not apply to the rigging or fittings on the mast and main boom.

The 1994 A Class rules do not use the ERS definitions so the requirement to use the original mast and/or main boom should be understood to apply to their spars i.e. the structural members to which fittings and rigging may be added.

Owners are reminded that the boat shall still comply with other class rules (weight, flotation etc) that may be affected when rigging is changed.