at closer inspection of front hubs whilst taking photos i noticed the difference between the "pair" of front brakes
1. i noticed the left one was year dated 89 part 20.892.00
and 88 part 20.4691.00
the right one was 85 part 20.4558.00
and 84 part 20.4557.00
2. this is what really racked me off the. left one was missing the "piston inserts"

ive tried to high light this one so you can see what "inserts" im talking about.

also the rubber seals are missing. i feel this auto dismantlers have really wasted my time and money and im going to fry them on there ebay feed back.
if some one can help me with the part numbers for this missing parts(piston inserts?), the rear hubs and the removable caliper brackets(for the rear) it would be a great help. as they are also parts left out.