Stock systems come in a number of colours as you have probably seen here:
http://www.toplace.com/cart/toplace-usa-...-p-38.html
Hair-samples are normally only sent in with a template in the case of a person who is ordering a custom-made system. There are so many `in-between`shades of colour,especially with browns, that a good -sized hair sample is needed......hair taken from the back of the head, tends to be darker than from the crown/front [worth bearing in mind] Hair sample should be about an inch long, and approximately the diameter of a pencil....can be held together with a small elastic band `doubled over`[ bit like a sheaf of wheat] John will know best what colour in a stock will best match your hair colour--- it`s hard to be accurate, as pictures can give a misleading impression of `tones`...... at a guess, looks to me like a medium brown [#7] would be a good match for your growing hair. Best wishes.