C5 RS6 01E 6-Speed Vibration/Axle Questions

[LarsMA]

Hello,

I have a 2003 C5 RS6 with a manual swap 01E. Currently at 100k miles, swap was done by previous owner about 5k miles ago. Started to notice vibration under load typically between 2-3k RPM usually in higher gears like 4th, 5th, 6th. Never noticeable in lower gears at any speed or RPM. Saw another post where people seemed to indicate it's common for front axle inner CVs to cause this issue. We already replaced rear diff bushing, checked transmission and motor mounts, replaced center bearing and bushing and it didn't help.

We pulled the axles recently and can't seem to locate ones that match the flange. Seems to me someone may have modified the flange on the axles that are currently installed.

Any help with what the correct axles are here? What the part numbers are and where to source?

Cheers,
Lars