Thanks for using Just Answer. I will be glad to assist you.
What model is the SEL (300, 420, or 560)?
What exact model 1989 do you have?
The starter is located on the lower passenger rear of engine.
Here is the repair procedure:
560SEC, SEL & SL
Unfortunately, the starters are not interchangeable.
1990 model:
1989 model:
Assistant Service Manager
Tires Plus