Hi bigboyga--just put my son on a flight back to Atlanta where he lives with his wife and teaches at Emery U. Anyway, I believe you are correct about front/back left/right being all the same, and I can verify that lens part number as I, too, have had to replace several that not so mysteriously went missing. Now I glue them on with a silicone adhesive that dosen't dry hard. Kind of a silly thing to have to be messin' with.......Regards, Mike