NITTO Technomic Tall Quill Stem NTC-280 and NTC-225 25.4mm
The regular is 225mm high, and will bring most cyclists' handlebars up to a comfortable height, but some might need or prefer even more height, so you can choose the super-tall 280mm (but it does cost rather more to get that much height, because of the beefier material, and it's rarely available).
280 x 50mm and 280 x 70mm
225 x 70mm