Bolt dims

Think about it.
On 73s the Steering arms are thru-bolted to the knuckles, IIRC.The shoulder on the bolt is the special part.
It is a very tight fit into the BJ and it indexes the BJ to the knuckle. Then the self-locking nut just has to keep it from falling out.The factory bolt also has a large rounded head. It might have been part of the steering stop system, I don't recall.

If you use a regular bolt there, the shoulder is too short and too baggy in the holes. Now you have to depend on the Nut torque to keep everything in alignment, so you better use a fine thread. Since the bolt is now baggy in the hole, you better use a hardened washer under the nut, to redistribute the clampload, and loc-tite to prevent the nut from working loose after the clampload relaxes. And then the whole thing might become too long and interfere with something else, I don't recall the clearance to the rotor.
Remember that all the braking force has to get into the chassis thru those bolts and the upper BJ pin
So just take a few minutes to think about it