These small plastic clips hold the lip of the vent panel to the body under the back of the hood. Watch the video for more detail.
6 black plastic clips as shown. Have these on hand any time you need to remove the two vent grills under the windshield
1972 to 1989 R107 Intake Air Vent Plastic Pin Fasteners x 6
$9.75
SKU:
BDP-107VENTCLIPS 
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1972 to 1989 R107 C107 Rear Hood Seal OEM
Often missing. Important to keep engine fumes from entering intake air vents. Not a hood pad. This is an important seal.
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R107 350SL 450SL 280SL 380SL 500SL 560SL Hood Opening Extender
We call it the 107 "head saver!" For all 107 from 1972 to 1989 - Raise the hood quickly to ease maintenance and prevent head injury! As seen on YouTube.
I have hit my head so many times on the grill edge while working on R107 engines that I finally decided to do something about it while recently changing the fuel injectors on a 380SL.