Need to locate chassis in # and chassis out # for replacements parts 99 Audi A4

What is your question?

The mechanic is searching for used parts. She said if we can locate these numbers it will help locate replacement parts. Already know the VIN but that is not what I need. Have to replace the rack and pinion assembly. It's a quattro 2.8 litre.

How long has your 1999 Audi A4 had this problem?

Been leaking power steering fluid about 2 weeks.