It's probably easier to make your own. All the A-frame or the Panhard will do is stop your rear end moving sideways under cornering forces. To be honest unless you are racing I would
stick with the flat springs and Koni's at the moment. You will be driving very hard to have problems with that set-up - and you can add the other bits on later if you need them. There is
a guy here who does some racing in his B110 coupe - putting out around 300 hp - and I believe he has no rear locating bars and still kicks booty.