Some of the kits such as BDS can be ordered with fox. Others allow you to order less their lift without shocks and get your own. All shock / strut manufacturers will make them just about any length you want. It's not new to the shock folks so call them and talk to them. It's likely they will already know what you need based on your truck, the lift etc.
Don't forget to support your local charity during the Christmas Season.
2013 F140 XLT 4X4 SOLD
2012 JK Rubicon