I know the 85 SE list price was a whopping $5630 more than the GSL, but does anybody know how much more the Leather option was?

 

I paid $16,500 for my in 1986. It was a dealer left over and he wanted to move it because the 86's were out.
If I recall, leather added another $450 or so.
You usually find leather with power steering equipped car for some reason but not always, but typically.
Don't ask me why.

 

you'll find there are some variances with he area where the car was sold new, for instance the GSL-SE
s around here seem to be either leather OR ps, its kind of rare to find both.