My two wheel drive has the same spots for lights, but there's no bulbs in them, the dash cluster is universal in the 99s.
The easiest way to tell if it's four-wheel drive is to check the VIN number online at Toyota's website, or look at the shifter console from an interior pic.
An e-locker would show up in an interior picture with an extra button with orange writing next to the interior light dim knob under the left hand side of the the gauge cluster.
Keep in mind, that an e-locker swap could have happened after it left the factory so that may not show up when you run the VIN number, but you can always ask the seller...
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1999 Toyota 4Runner SR5 Sport 4WD, V6 5-Speed e-Locker->
4WD 4runner Journal Thread
1999 Toyota 4Runner SR5 Un-Sported 2WD, V6 Auto ->
2WD 4runner Journal Thread
1959 Chevy 3100 1/2 Ton Pickup EVERYTHING done 'cept paint and body
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