My bridle that has a contoured noseband (wider in the middle and narrowing on the sides) is from Flexible Fit: http://www.ffequestrian.com.au/bridle-parts/nosebands/anatomical-converter-crank-raised-english-leather-flexi-fit-gel-padded-double-noseband-black-stainless-steel.html
They use Sedgewick’s leather and the quality is very nice for the price.