I have an original; 8M Brochure but it is on the boat and I am trying to ascertain some mainsail details.

What is the area of the 8M mainsail.
Any idea of the cloth weight.

I need to get a new inmast furling mainsail and wonder how the spec proposed by the sailmaker compares to the original regarding weight of cloth and whether this is dictated by the inmast furling requirement rather than what is best weight of cloth in a main?