Be aware that stock systems are a middle-of-the-road solution .....some people find they`re a perfect fit, others will find the perimeter will tend to crease/ pleat in places ...this is because your skull-shape is individual to you and may not be fully ` compatible` with the ` standard ` curvature of a stock...just something to bear in mind.
In my opinion, If you intend to order stock, if you think the color may not be an exact match to your growing -hair, go for a slightly darker shade ...after a few washes and exposure to sun, it`ll `lighten`....in the meantime, you can use things like gels to make your own look darker, in order to give a better-looking ` match` .....all system-hair oxidizes and looks ` lighter` after a while.