I think if you start a new thread, ask your question CLEARLY, ADD AN ARROW pointing to what you are referring to, and what's your doubt, you might get more relevant eyeballs and possibly some useful answers.
This thread is for COST OF MAINTAINING AN E36, not I GOT THIS PROBLEM W MY E36 AND I NEED ADVICE....
Mainly, two types of people read/post in this thread.
People who have just serviced their e36 and want to update the post w their cost.
Or people or newbie who want to check the latest cost of some parts they are not familiar with.
So, am not surprised you did not get any advice. You did not address it in the correct place. By the way, if that was your steering rack leaking, shyang_my is right, get it serviced/changed/rebuilt, it's on the way out.
And since you do not trust the word of your mechanic, and think he's trying to 'slaughter' you for 100 bucks, check out the LIST OF WORKSHOP WE GO TO thread for alternatives. Your mechanic saw the problem w his own eyes. We are looking at some grainy mobile phone shots, trying to guess what you mean by the unspecified 'middle thingy'. Any opinion would be as murky as your photos.
Now do you see why no response?