I had been keeping that to myself after I found it until I had one in front of me to make sure it was the real copper/brass deal...just never got 'round to it...

This is by far the cheapest at $145
Spectra Premium~ CU672 ~

Edit: This of course will fit any W123 but has no provision for the overflow tank. It does have the ATF cooler built in though. I think it is the wider radiator unlike the 240D / NA 300D type which is a bit narrower

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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD