If you ever order a rear end flange, or any other driveshaft related part from 600, order one of each. I needed a rear flange, and they asked what color my driveshaft was. It's white, so they sent me a part. Of course its the wrong one. At some point in time, my driveshaft was gray, but a previous owner painted it white. Now I have to pay $60 to have the "correct" part overnighted so the car is ready for the weekend. Would have saved $15.00 just buying one of each.
Some time ago, they switched driveshafts, and instead of marking them in some way, with a serial number, or an INEX stamp or something, they just began painting them grey instead of white. I would guess mine was painted white to match the chassis by the former owner.
Just wanted to save someone else a headache and waste of money.