there is not front and rear, just preferences about PNs on front and rear.

Try to image bolt with a nut in place of a T bar. fit the bolt head on crossmember and nut in front. you will tight nut CW. Now fit reversed with nut on crossmember... you still will tight CW the bolt.

The other side is the same with CCW thread.

With a Charger born in Chrysler assembly plant in Valencia, Venezuela