I found a new, oem turn signal lens assembly (S80 front, 2000) on-line from ThePartsPlace or The AutoPartsPlace, something like that. $46 plus shipping, plus oil drain gasket for 19c.

Replacement time is measured in seconds, a snap tang beside the headlight releases it, hidden from view but a 6" screwdriver reaches fine.

 

Yesterday I replaced the left fog light on my S80. A rock took out the lens. You have to replace the whole unit. The lens doesn't come off by itself. The whole unit cost something like $90 at one of the online places.

You'll want a long handled T20 Torx to remove the three screws. It was an easy fix.