A body - B body spindle swap
11-72 is a 1973 Model year car.
The taller spindle with large bearings is found on cars with Isolated K-members. Meaning the K-member has rubber bushings between it and the unibody frame.
Looks like this. See the rubber biscuit and front and back of K-member?
![](http://i80.photobucket.com/albums/j172/Charger34/P3201042.jpg)