John, I'll be happy for the info as I'd like to see how Dennis' '83 compares to yours and mine, which are 'Gen-1'.
I have provided an extra set of tangs about 3/4 up the mast to serve for running backstays and installed a tang on the front of the mast above the pole-lift sheave box, in order that this can be used to fly an inner staysail. My original idea was to be able to have a smallish sail up, closer to the CLR, for when powering through canals, etc., in case the motor quits. This enables an awning to be set over the lowered mainsail. I've repurposed the original shroud tangs (and shrouds) for the running backs, as I got a very nice pair of double-hole tangs from DAMCo for the lower shrouds, and have two original tangs left over. But they have 3/16" pin holes, not 1/4", so apparently I have mislaid the original upper-shroud tangs. Grrr.
I am grateful to Dennis for the well-made drawing and am only anxious for finding out if the tangs use for the double upper-shroud ones are in fact merely twice as many as were used for the single upper-shroud ones.