Good to see your post! I'm always glad to see another person ready to tackle a headlight conversion on an '86+ 240. See my car's pic below...
My e-code conversion uses 6" x 8" headlamp buckets from an early '90's Isuzu pickup. I considered Mercedes but the 6x8 ones I pulled would have been very difficult to fabricate into the 240. The assembly was a plastic casting with a "stepped" rear surface - that is, not a flat plane. The headlight buckets I got instead have four mounting "feet" that made that part of the project a bit easier.
The 240 radiator support bracket is basically a flat plane going across so plan around that fact. If you're committed to the M-B assembly then plan on building up the rear as needed to meet the 240's flat plane.
Also re. grilles - you may need a narrower grill than the '89 grill. The '86+ 240 grill only allows for the 13" width of the headlight lens. The earlier 240 grill is narrower and also taller. Of course narrower will fit however the outer ends of grill will not line up with the hood's raised center portion. What may be a larger concern is that I believe the total height of grill is greater than the space available in the '86+ 240. You can change that metal strip but I wasn't willing to get into sheet metal work that would require finishing and paint matching and probably spot welding.
If the grill story is as I described above, and you need a narrower grill, check some of the newer Volvos in junkyards. Attachment methods will be different but you'll be doing your share of fabrication anyway. If an 850 or 940/960 grill meets your needs then go for it.
I used www.rallylights.com as my source for e-code housings and H4 bulbs. Headlight relays from junkyard 240s. Those relays are stamped as handling 15A x two output terminals. You should add diodes outside the relays to cancel out back emf when you shut off the headlights - it shut down my radio several times weekly until I added the diodes. Read about it at rallylights.com under "tech information" or something like that - there's a tech know-how section on the site.
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Sven: '89 245 NA, 951 ECU, open-front airbox, E-fan, 205/65-15's, IPD sways, E-Codes, amber front corner reflectors, quad horns. Wifemobile '89 245 NA stock. 90 244 NA spare, runs.
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