wobble sound

[zzzz]

so...
as i was sure the sound is coming from the front, im not any more...
i jacked up the rear of the truck and found play in both wheels...
so i have to replace wheel bearings but looking at the store, they have 2 different dimensions and i dont know how to figure out wich one is for my truck...without taking it apart...
is it 9.25'' or 10.5'' ring???

 

[brokenarrowjbe]

I think that one is outer and one is inner. So, both.

 

[zzzz]

I think that one is outer and one is inner. So, both.

why do i need both?