Maybe. It seems like they are pretty cheap to have built to spec these days if it comes to that. I'd really prefer ones that look original if possible. Then again, original oil coolers seem to cost more (even dented up used ones on eBay) than what it might cost to have a custom radiator and oil cooler made. It's also sad that radiator shops won't rebuild or weld the old aluminum oil coolers.

But, I could see sectioning the upper and lower tanks on a W108/W110/W111 radiator so a W108 oil cooler would fit next to it and then just using a thicker core to compensate for the narrowing of the radiator. Hopefully the W108 oil cooler would be the flat-side type that screws into the radiator core support.

Using a stock W108 oil cooler (that will screw into the radiator core support) and then narrowing and recoring a W108/W110/W111 radiator is probably what I'll do unless there is a W108 radiator and oil cooler that will drop right in, or I can get a custom built radiator and oil cooler that's economical and doesn't look too out of place.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles