I beleive all W210s originally had the ugly looking triangle keys, the chrome capped keys came in somewhere around 05. But you can just order a key from the dealer, it will be the new chrome capped one.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)