Vespa 50 s front glove box

Hi everybody! i am thinking about getting a glovebox on the legshield of my vespa 50 s 1974 mod, but i am scared if it will take too much space on the small vespa. I am a quite big guy so it would be great if anybody had the measurements(cm) of the glove box sold on this site.
thank you for any help :)  

Funny question. If you have any doubts it's no other use than trying out.
Or maybe you make some dummy made out of cardboard and adhesive tape.