smog pump rebuilder
I recently worked on a 1990 190E with a bad smog air pump. It was making a terrible noise whenever it kicked in. It was defective and here in CA we can't pass smog if it's not working. I searched around for a new or rebuilt one and the best price i got was for a rebuilt one from CVJ Axles in Denver. Cost was $295 and has a 3yr warranty.
I'm giving you this info just-in-case someone tries to sell you a $600 pump and you have to put it in for smog purposes.
1982 300D Turbo