My spindle sleeve kit includes 2 spacers and 2 seals so you can run '73 and newer A,B,E,F,M,J body 10.95" or 11.75" rotors on '70-'72 B or E body disc knuckles.

Use '73 and newer inner wheel bearings.

Of course, you must also change the caliper brackets, if you want to run the larger 11.75" rotors.