All 1st and 2nd gen 4x4 trucks with the 2.6 engine have radiators with the dimensions of your '85. The only big difference is the Gen1 radiators are two row while the Gen 2 are single row. I believe the 2wd trucks with the 2.6 engines radiators of the same size, too.
Here's are a couple threads that discuss radiator options that could work for your truck:
http://www.mightyram50.net/vbulletin...shi-Mighty-Max
http://www.mightyram50.net/vbulletin...0282#post80282
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