Oy, my head hurts....

p/n 011 545 97 32, as listed by Myarmar, is available from a parts yard I found which specializes in MB parts. I went to double-check it on my car, however, and found mine to have p/n 009 545 91 32 instead. Called them back and they told me they do not have one by that p/n, and in fact that p/n didn't even come up in their database. So.....

Anyone know if these two part numbers interchange? Not having the car fixed is killing me!

-Brian