On my H23 (1985 with a Kenyan mast), only the backstay attaches to the masthead.. on the part that protrudes rearward (known as the 'crane'). A pin secures it to the end of the backstay which terminates in an eye fitting. The forestay attaches to the front of the mast approx. 3 feet below the masthead (just above where the jib halyard exits) using a t-ball fitting.
Sorry.. I don't have any pictures handy, but you can get an idea of general location from the sail plan drawing.
Cheers,
Brad