Rubber Boot (Do I need it)

[geunther]

Im ordering some parts to get my brakes up to snuff. One thing I need is the rubber boot that goes tween the master cylinder and booster. I have that all lined up and know what I need (pic 1), but when I was searching I kept seeing pictures of another rubber boot (pic 2). I don't know where it would go, or if I even need it. Perhaps it goes on trucks with manual brakes.

If I need it, I would like to order it now so I can do it all at once. Thanks