Half shaft boot question

[Ajax MD]

Hm, here's a new wrinkle to the CV Boot discussion-

I've torn another boot so I'm on AM Gen's website looking to buy the real part. I have 7k axles.
What is the difference between "fixed" and "plunge" boots?

HALFSHAFT FIXED BOOT KIT 12341985 SHAFTS (5705605) - Chassis | Genuine Humvee Parts

A0 A1 - 5705605 - HALFSHAFT FIXED BOOT KIT 12341985 SHAFTS - 2530-01-191-8741

genuinehumveeparts.com

HALFSHAFT PLUNGE BOOT KIT 12341985 SHAFTS (5705606) - Chassis | Genuine Humvee Parts

A0 A1 - 5705606 - HALFSHAFT PLUNGE BOOT KIT 12341985 SHAFTS - 2530-01-191-8740

genuinehumveeparts.com

We've settled for Autozone boots for so long that now I'm scratching my head when I can buy the correct part.

 

[Ajax MD]

Wait, I think I've figured it out- One is inner and one is outer. Cripes, why couldn't they just say that?