Were working on a 1989 Toyota Pickup, and need parts for the headlights, and were wondering if parts from a tercell would work?
Also if not, what toyota cars would work for a 1989 toyota?

Generally parts from a Toyota truck are not interchangeable with a Toyota car. I guess anything is really possible if you want to take the time to modify the part. It depends which headlight parts you are trying to use. If you are using electronic parts you need to know the system voltage and schematic to see if your parts will even work. Be careful to not short out any electrical components because your project will become very expensive.