Well I would think they'd be the same but the ranger frame does come in different wheel base lengths. Not sure if it did that year but I know the new ones do. I know the explorer(ranger frame) has a shorter wheel base in the 2 door version than the 4 door version. So you would think an extended cab ranger would have a longer wheel base than the regular cab. Not positive on that though. I would think as long as both trucks are either regular or extend cab the bed would work without too much modification. Or you could measure to be sure.
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