I added the WR Long 3rd function kit. I got it from Everything Attachments when I ordered my grapple from them. Its a kit that is easy enough to install. Several videos online on how to to do it. The hardest part is replacing the hard hydraulic line and putting the valve in its place. It connects to the power beyond port on your main valve system. Its sounds harder that it is.
For me though, it has been a love hate relationship with my kit. It died after a about a year, the circuit board, as simple as it is, broke somehow. I had to replace it on the valve. But since that day, its worked perfectly! The other issue I had was the replacement joystick, it's hollow plastic and feels cheap in the hands compared to the factory LS joystick. But that allows for the switch. I was also not a fan of the switch, and preferred buttons. So I replaced the entire joystick! I replaced it with a NIMCO and a new stem for better ergonomics.
Here is some links:
NIMCO Joystick
Stem
WR Long Kit
Here is the video I made of the process of fixing my kit and adding the new joystick: