 Rear lower body bits
On our '98ti at the rear most of the rockers just in front of the rear rear wells is whats left of a black plastic "water deflector??". Its not shown on Realoem but might come as a part of the item shown below. Right behind these is the only rust on the car and I bet its because these are mostly missing.
Any ideas and a part number??
#2 in "Rear floor parts" illustration on Realoem
Rear left side member 1 41118189975 $112.72
only in conjunction with stopper | 
Threaded Mode