Jerry-
I'm sure you'll love the "A" cat! Very hard to give specifics on these boats as the masts can be different (the older Mk IV's even had aluminum masts though most have upgraded to CF- but could be Saarberg, Hall, Fiberfoam, etc. CF mast) and the sails can be very different materials (Dacron, Pentex, etc.) built by different sailmakers (Goodall, Ashby, Danger, Landenberger, Glaser, Ullman, etc.). Best thing to do in your particular case is to note type of mast (if possible), year of boat (if can't ID mast will at least give a clue), sailmaker and year of sail (if possible) and E-mail the sailmaker for suggestions as to prebend, rake, spreader length, etc.

Enjoy!

Kirt