Going to Do Clavicle Lengthening

I am narrow but I am not the narrowest guy you will see. Probably because I am on the taller side. I do not know my exact shoulder width but I can judge enough to know that I have a small frame. I have thin wrists, but so does my dad and he has wide shoulders so I guess that theory is kind of inaccurate. I am hoping to gain atleast 2cm per clavicle which will be a 1.5 inch increase full clavicle wise. If not 1.5 cm and then I will get 1cm deltoid implants. 2cm on each clavicle is a big difference.