If you have 5100s already in the front with the stock coils (im asuming), you can add a top plate soacer for a full 3". Or you can get ome 885s to go with the 5100s and set the collar at the lowest setting and you will get 3" I believe.
Toytec's adjustable 5100s is basically a 5100 shock with eibach coils with an adjustable collar. Your 5100s are already adjustable to 2.5" Personally I would just add OME 885s and adjust your 5100s accordingly for lift preference. My opinion you are getting a comparable quality for a way cheaper price. This is the setup I plan on running up front and 5100s in the rear with toytec superflex coils.