You will need to swap the proper pin from the 'dry' trailing arm, or alternatively, swap the entire trailing arm to mount the shocker. Not easy to swap the pins as you'd probably need a 10 tonne press. This of course means removing the arms from the subframe, depressurizing the suspension etc. A lot of work
I have seen this done on hydro cars along with shockers mounted at the front as well. The snag is the brake lines are different on wet & dry trailing arms, so you need to think about it.
No doubt others will wonder why U R attempting this conversion.
