sorry I can not hlep but will send this to the top so someone might see it who can help.
Sorry just found some very expensive at embroiderydesigns.com and one in a FSL-design at urban thread for 5,-$.
Hope some other cuties knew better designs :o)
Thanks Bettina - what I had in mind was an over-sized buttonhole in the shape of a keyhole. Might be driven to learn how to digitize at this rate!!