Hello everyone.

Might be an odd question but I'm trying to buy pads and rotors for my parents car and the site RockAuto) keeps asking me if its a standard chassis or a heavy duty chassis.
I'm not sure where to look on the car to find out. I've looked up the VIN but that didn't help.

its a 1992 sedan deville

looking at the pictures on rockauto the only visual difference is on the pads and id rather not have to take it apart to see which pads are on the car, just to have to put the old stuff back on till i can order the new stuff