Thank you so much to both of you.
I have had the chance to obtain real B737-200 throttle for my simulator. On them I can see only 2 detents. Once the throttle handles on iddle position it is possible to activate the reversers. So the first detent (the only one) is at about 3/4 of it's course and left 1/4 to full reverse... So I suppose they are differents from 737NG throttle. I know it is a little different from outside but do not know for the mecanism.
Thank you for your help making my sim as real as possible