My Serengeti's are GG6692. Someone with sticky fingers lifted a pair of mine a few years ago and I was in your situation where no one seemed to sell them anymore, as everyone wants polarised lenses and I think what they called "Drivers" graduated lenses - great for driving but not so much for flying above cloud. While waiting to find a replacement pair I tried my trusty polarised Maui Jims - great except for the fact I had a hard time seeing out of the windshield due to the heater elements. Looked like you'd started your Cessna with the oil cap off.
Finally found the frame number (above) somehow and turns out you can get a decent sunnies shop to order them in for around $340-$380. GG6692...far more important a number than even my ARN.
