An infrequent poster, BENZ-LGB, who is a good friend of mine, is our resident expert on W124 Euro light installs, and has posted several times with pictures and instructions and detailed explanations on how to do it.

Use the search function to find those posts or search his user name till you find them

If that is still not enough, PM me, and I can personally foward your request to him if you want. He is a kind person and very engaging and helpful

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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...

1995 E 420, 170k "The Red Plum" (sold)

2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp

1967 Mercury Cougar, 49k

2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive (sold)