IKEA castors from old desk chair (Kendal LA9)

5 castors for IKEA desk chair (only particular castors fit IKEA) The castors on my chair are useless so wondered if anyone who is disposing of an Ikea chair with castors might be able to remove them and freegle them. Seddox 10mm stem diameter (roller blade style wheels) would be wonderful and worth my posting a WANTED! Thanks folk! Eileen