no front/back ex some have an ID number/letter combo on one end & if so I put that end at the rear so I can visually ID it at a later date if need be (plus mike the dia). I would suggest not marring the old ones as things might change later & you might need or want to sell/trade them. have the tire/wheel off & jack up the LCA just the right amt all to get everything as light as possible and in a straight line as possible & on A bodies I tap the front LCA tapered stud rearward a bit to get the whole scheband moved rearward some then on the rear side of the Kmember tap the LCA forward to get it to come forward from the tbar hex then it is easier at that point to get the tbar able to be moved rearward/free to seperate it. grab a helper if you can.