* Your vehicle's registration: Sometimes the registration paperwork will list wheel specifications.
* The sticker inside the driver's side door jamb: This often has the tire size and other vehicle specifications, which can help you determine the bolt pattern.
* The wheel itself: Look at the existing wheel. The bolt pattern (e.g., 5x114.3mm or 5x4.5") is often stamped on the back of the wheel.
* Your owner's manual: If you still have it, this will likely specify the bolt pattern for your specific Dakota model.
Without knowing the specific trim level of your 1989 Dodge Dakota, it's impossible to give a definitive answer. Common bolt patterns for that era include 5x114.3mm (5x4.5") and 5x127mm (5x5").