if it doesnt look the same, be sure to look and measure the bolt pattern to verify. There is a change of flex disk design at a VIN cut off and you could have gotten the wrong one, many parts places dont realize that within a year run that are a few different flex disks and you have to check VIN. They do use different style bolt heads alot, no rhyme or reason on which they will give you with the aftermarket flex disks, but they all work. I have had to buy a new socket set to use the bolts I was give before, internal funky star bolt sockets are in my tool box now.
I was sold the wrong one once also, they even knew the cut off and intended to send the correct one and it still got messed up. For flex disks and center bearings I get them from the dealer due to the VIN issues. Plus For the flex disks, I paid the same price at my dealer as I did at the mail order place, got OEM quality and it was th correct part to boot. Always chcek the dealer on cost, occasionally their cost is the same or even better and you get MB parts!

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red