Fork Springs
Anyone thinking of uprating their front forks here is a couple of firms who will make the springs to your requirements.
This site calculates the spring rate for you and the bike’s weight.

So for my 1200 Breva the info required is: 38mm outside diameter, 280mm long, 1.0kg/mm constant spring rate and 120mm of travel (taken from workshop manual).
I used Springcoil at £60 the pair but Faulkners were very helpful too.

Are those progressive ot single weight?

They are single rate.
I did a bit of research and the experts tend to go for single rate. I suppose it makes sense if you are applying the correct spring to your weight.