they are extremely easy to install.
just push the protruding tab under the hood and they pop right out.
however, the set i purchased off of e-bay had a 2 prong connector which made the running lights useless. i stole the connectors off my old ones ( with adding a fat o-ring on both of the old sockets ) and they work fine. i think they look even better with euro headlights though.
if you have any questions feel free to e-mail me.
good luck,
adam

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87 300E
BLACK GOLD WITH CREAM INTERIOR, SPOILER, AIRDAM
CLEAR MARKERS

87 420SEL
BRONZE WITH CREAM INTERIOR