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Just to be sure we're all on the same page.

Gen I SWB Trucks:
A/T Oil - Two in series coolers. One inside the radiator. One air cooled radiator.
M/T Oil - N/A.
Engine Oil - None.

Gen I LWB Trucks:
A/T Oil - Two in series coolers. One inside the radiator. One air cooled radiator.
M/T Oil - N/A.
Engine Oil - One air cooled radiator.


Well, almost. Those with turbos in SWB/MTs probably have engine oil coolers. I don't offer this up as a smart ass answer, but as another possible solution.

If you can't find an LWB oil cooler, perhaps a Starion oil cooler could be adapted.

87 Montero, bought new, by me -
88/89 intercooled Starion Turbo engine-
with awesome audio.