95 has the antitheft starter interrupt through the IR remote lock system, probably a good idea just to bypass it.

97 has a DAS X system with a RFID chip in the key or fob, this cuts fuel injector pulse.

I'm pretty sure the metal bit is the same between the two. ( Narrow ) I don't have a 97 W210 key handy. I know the 97 R129 has a wide blade.

The 97 W202 and W210 share the same door handle / door lock cylinder, I looked into this to put a real key in the drivers door.

What are you doing with the E320 ?