I need to replace my clutch (after 165,000m) and have been told variously that: A. I absolutely will need to also replace the dual mass flywheel, B. If the flywheel is not torn up it can be machined and reused, C. the flywheel cannot be machined, D replace the DMF with a solid flywheel. Any input woould be appreciated.

The replacement DMF is running about $ 650 but I have seen a LUK oem replacement for as little as 375 (ebay). Any experience with the LUK parts?

Thanks
1992 525i, m50, manual, 165k miles