Where can I source a dome plexi for 16808 Sub?

[andrewsabz12]

Hi All - I have a 16808 Sub which comes with a sapphire crystal but I noticed this example 16808 that has put an aftermarket domed plexiglass for a more vintage look and without cyclops. Anyone know where I could source one of these? I believe a factory 1680 plexiglass would NOT fit on a 16808 (important to note it’s a 16808, not a 1680/8) example pic here, thanks!