Door wiring help

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We have a 98 C2500 service truck,(used to be a pickup), that I'm trying to replace the driver's door on. I picked up a an 89 driver's door, but the wires on it are a larger gauge to begin with, but I'm not sure how to splice the 89 wires into the 98's wires. Not worried about the power door locks, just both front windows. The current one in the 98 is in the bottom of the door as someone bent the regulator every which way. Any help would be greatly appreciated. I can't upload photos as it says there's a security token missing. Sorry