Hi have a nice 07 E320...Perfect except my vent knobs have fallen off.
Hard to aim my vents,have used a pen a straw and sometimes my fingers.
Definetly not ideal.
Checked with dealer and parts not sold separately.Dont want to spend a small fortune and buy vent assemblies plus installation charge.
Checked on ebay and found a potential fix.Item found by searching
"mercedes vent slider" .
Perfect easy install and fair price.Did it myself in seconds.