Help needed obtaining parts 1993 Charade g102 1.3i auto

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Hi all, having some problems obtaining parts for our charade. We need an osf cv joint, and having problems identifying which one we need, as well as where we can get one. Also, we have been told that one of the back brakes isn't doing much, and my mechanic is pretty convinced this problem is down to some kind of brake fluid distribution box mounted to the bulk head. Not sure what this part is called. If anyone could help identify any of these part numbers, or point us in the right direction we would be very grateful. Our charade has only done 30k miles so would like to keep it on the road a bit longer. Many thanks for any help.