G'Day KSM, and welcome to CF...
A word of warning: if you are wanting the measurements in order to buy second hand sails
or such, remember that there are a lot of different boats that call themselves "H-28". For that purpose, you should really measure the specific boat that the sails
If you need the measurements for analyzing the SA to D ratio or such, then generic measurements will suffice and a site like sailboatdata.com will likely have what you need.
Cheers and good luck in your quest.