Changing the ATF fluid and filter in my 1988 S4

[911blex]

I am in the middle of changing the ATF and filter in my 1988 S4. Are there an other preventative maintenance items I should consider taking care/replace while doing this job?

It seems to me that the o-ring that goes between the reservoir and the oil pan (part 477 321 487), the 90 degree oil hose that connects to the top reservoir, and the o-ring for the oil cap might be items I should replace due to age.

[Danglerb]

I always like to check the price before I form an opinion on replacing anything. I figure the more Porsche charges the longer the life expectancy should be.