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]