Head light bezel help

[Kalums]

Ok I've tried searching the interwebs and on here aaannnndddd the internet over lords hate me today.... So here goes: I've got a 1971 GMC K2500... I have no idea what happened to the original grill, but I have a suspicion it was chopped up previously. At some point it got this wierd chrome tube set up (not my style, but to each their own) I've got another doner that looks pretty good a few minor dings and small other blemishes but 20 bucks and it wasn't going to get passed up on. Either way my question is are the head light bezels "ambidextrous" can they be on either side? or is left - left and right-right and "never the two shall swap"? Because in the factory replacement I got both of my bezels will fit the passenger side but neither fits the driver's side correctly and the previous grill had extra holes drilled in the driver's side to accommodate this miss match or? Whatever the case/reason. Any help would be greatly appreciated. TIA.