How do you change the headlight lens on a 1988 Saab 900?

The headlight assembly is held in with four bolts: two on the top, one underneath, and one that connects the headlight assy to the turn signal assy. The frame can be removed from the headlight by carefully prying at the adjustment pins. Complete information is on page 351-3 of the Official Saab 900 Manual by Robert Bentley Publishing, which every Saab owner should own.