;mute; GUIScale 5 is the basis of the calculations

Item size - can be changed
{itemsize=0.8}

Calculate how much we need to scale the item to make it fit a fixed a fixed width, height and position.
{itemscale=(itemsize/guiscale)*5}
%guiscale==6, "{offset=0}", "{offset=0.5}"%
{tempscale=itemscale*16}

8 pixels

;helmet,width/2-tempscale-offset-guiscale,height/2-tempscale+0.5,itemscale;
;chestplate,width/2-tempscale-offset-guiscale,height/2+0.1,itemscale;
;pants,width/2-offset+guiscale+0.5,height/2-tempscale+0.5,itemscale;
;boots,width/2-offset+guiscale+0.5,height/2+0.5,itemscale;