Why do you want to change spark plugs. Are they not working fine. Jdms don't need to change sparkplugs very early. I recently changed first time one of vitz sparkplugs which was 1lac km driven. If they are having some rust.buff them. But dont change them. If they are black from base then change them. If spark plugs of vitz and passo are same then orignal 3 denso plugs only cost 2900-3200rs. Ask these suppliers tomorrow for your confirmation +92 333 3035482, 051 5582798, 051 5564952. Even first one can ship