Based on my '79 Hobie, I believe Hobie may have changed the design of this "reinforcement" kit. My shrouds have a half circle plate design with four screws very close together on the circumference of the plate. The current design, and the one that you would get if you purchased the shroud brackets now, is a larger "D" shaped bracket, with the screws spaced further apart.
The "reinforcement kit" is made up of the newer style shroud anchor plates. The load is distributed a bit more than the 70s anchor plates.