Either one would work, I believe the 3198 is the one that needs adapter brackets on a 2000 model year (whichever one is currently sold by MB would need the adapter brackets on a 2000).
The newer one is somewhat narrower than what was sold in 2000, so needs these adapters to fit the wider bracket. The bracket itself is already part of the car, it's what the amp mounts to.
Gilly
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