When I built my first longboard I couldn’t find right size pulley for motor from Europe. Now I have a box full of 13T 14T 15T HTD5M pulleys for 9mm belt. Bore size is 8mm.
They are made of aluminium and includes scrub screw and keyway. The price for the set (3 pulleys) is 25e including postage to Europe. If you need just one pulley the price with shipping to Europe is 15e