A few pics of the 450SEL with bits removed - this is what's behind all that trim, wood and chrome.
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Windscreen / wiper channel - the little caged thing is some sort of thermostat that controls the HVAC blower fan - to remove the fan, you have to remove that first.
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Behind the dash - lots of wires and HVAC controls.
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In the boot / behind the back seat: fuel tank, first aid kit hole and vacuum tank(?)
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Windscreen / wiper channel - the little caged thing is some sort of thermostat that controls the HVAC blower fan - to remove the fan, you have to remove that first.

Behind the dash - lots of wires and HVAC controls.
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In the boot / behind the back seat: fuel tank, first aid kit hole and vacuum tank(?)