Is this actually cut to the VIN for the car, or just a "Shop cylinder"? I only ask because when I went for a spare cylinder for my '91 350SD in 2019, they no longer cut the cylinder for VIN matching, although they could still cut the key.

If you haven't already done so, verify that the key that came with the new cylinder works with the rest of your car and that your existing keys work with the cylinder.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]

Yes, cut to VIN and works with the rest of the car. They needed the VIN, registration of the car and my ID.

Had to change the tumbler on my old 300CD fifteen years ago and needed to change all the locks because I wanted to use one single key for the locks and ignition and not a different key just for the ignition. Back then they couldn't cut it to VIN for the W123, did cost me $750 for the tumbler, three cylinders and two keys.

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).