Originally on my car, both were the same and were the 'can' styles. When I ordered the new FEQ ones, they arrived as the 'bolt' style. I did replace both because I just didn't want to go under the car again or remove the rear end differential twice. As for the loose 'bolts' they were only loose on one of the new axles not on both. Again, squeeze the inner CV boot on your right side. If it 'wheezes' could be those allen bolts are loose.

Doug