[s-cars] tail light probs

[Harold McComas]

I had a reverse light go out on me and I went to replace it. Noticed a couple of problems:

1. Audi doesn't really list the part numbers of bulbs in the owners manual. They just tell you what wattage, so I am assuming if it is 21W bulb the part number is P21W. Eventually I found the US part # in a store, but does anybody have a listing of all the bulbs required and their part numbers online?

2. My reverse bulb holders are really corroded, to the point that I want to replace them. Is this a problem others have experienced or am I just "lucky"?

3. Related to # 2. Took my car to the car wash and noticed some water dripping into the trunk. Looked like it was coming from the tail light area. I haven't really looked  but do these tail lights use a rubber/foam gasket or some sealant?

Just looking for any BTDT advice. The S6 is a sedan,thanks.

Harold
85 VW GTI
96 Audi S6