Yeah mix and match, rear you run the lock in between body and cradle, front run the lock that goes under the cradle and is held in by the retaining nut. Remmember to trim the little bead of rubber off the bush so that you can get the nut back on..... many forget Oh yeah if you do do this you will get a much better bite into the pineaples (less walk) we have no cradle movement at all without locks, but you must trim the beads off..
i just installed the super pineapples to CATS car last night which give an extra 3-4mm cradle angle... still chasing grip.