There are two bolts and one nut holding the regulator. There is another nut or bolt with a dab of red paint. DON'T touch this other nut or bolt as it's for adjusting the window.

Also, I couldn't get the regulator out without detaching the motor and angle drive (extra beam on my 91?). I released the regulator and raised it so all three angle drive bolts were accessible from the squarish hole under the quarter window. With the motor and angle drive detached, the regulator can slide out of the big hole towards the bottom of the door.

When I removed the angle drive, the regulator spring caught my finger. Next time, I'll start with the window up

Be careful when peening the rivet. On wrong blow and you'll smash the new jaw. If you haven't bought new jaws yet, they should be cheaper than $12 through Fastlane.

Sixto
91 300SE