Turns out the 240D rad oem # 1235011201 is OEM for the 300D non turbo without A/C.

With A/C the oem 300D rad is1235014401.

I suppose the extra width helps with the engine load when A/C is in use.

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD