I am willing to bet that you have to remove the fan first... it's REALLY tight on the 123 vehicles. the SD is easier, lots more room.
I have found a local source for a replacement radiator, for 179.00 but it's a modine... never heard of it before, is it any good? Nissens and Bocsh I have heard of... they are not as low priced though.

John

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!