Difference in steering knuckles

[hawkeye]

I have 2 sets of steering knuckles for my 70 charger. One set is identical to the one in the photo and the other set's spindles are only 1 1/4" where the photo is 1 3/8". Other than the spindle size they appear to be identical. Can anyone educate me on what I have? Thanks!

 

[badlite]

If every thing else is the same then it doesn't matter, Different years I would imagine, engineering change possibly

 

[plazomat]

I am no expert but isn't the small bearing (1 1/4) one for 70-72 B/E disk brake front ends and the big ones the sought after 75 A-Body piece?

BTW - Dr Diff makes a bearing spacer that allows you to use the 11.75 rotors and bearings etc with the small spindle..I have some they work great.

PLAZ