The B5-B6-B7 Panzer Plate has the same bolt pattern as the C5 chassis Audi A6 belly pan and thus fits the C5 chassis. This has been tested on a 2001 A6 2.7T twin turbo model.
The B5-B6-B7 Panzer was originally tailored for the Audi A4 and B5/5.5 Passat which are physically smaller cars so when fitted to the C5 A6 the outer edges will not tuck under the front bumper skin the same way it will on the A4 and Passat. Here is a picture of the right side and the left side is similar. It is a very good fit, however, considering the protection the Panzer provides. The install is exactly the same as with the B5-B6-B7 chassis cars. This plate will protect your engine like no plastic belly pan can! Only fits 4 and 6 cylinder C5 chassis Audi A6. Will not fit V8-equipped Audi A6 or any Allroad.