Resizing elements to screen size within Array

Hey all. I've a variation on the frequent resizing GUI elements according to screen size question. I can't find the answer to this one.

At the moment I'm using this:

 hudWindowRect = Rect((hudWindowRectX / 100) * Screen.width, (hudWindowRectY / 100) * Screen.height, (hudWindowRectW / 100) * Screen.width, (hudWindowRectH / 100) * Screen.height);

This works fine for individual Rects; I've the Rect object itself set to private and then I have the 4 float variables (X, Y, Width, Height) so I can get the positioning correct through the inspector while running the game. And everything resizes perfectly if I change resolution.

I'm now creating a rect array, so I can have a selection of buttons in it, which then in turn point to different scripts that I pull info from. How would I go about getting each one of those to resize?

 var index=0;
     
     for(var a in shipsToBuy){
     
         if(GUI.Button(shipsToBuyPosition[index],shipsToBuy[index].shipIcon, "ShipButtonStyle")){
 
 }

The above is just a small snippet. Everything is working apart from the resizing and position of the buttons according to screen size. shipsToBuyPosition[] is the Rect array here.

Any ideas?