What is the opinion of Reddit about the
ONECAP Carbon 169/125 Keys Japanese Version Keycap Cherry Profile PBT Dye-Sublimated Keycap for Mechanical Keyboard(125 Keys, Japanese Version)?

There are two ways to find sets that will fit. The first way is to order a GMK or Pimpmykeyboard set. They are almost sold as a Base Set + other kits. You will need an Arrow/Nav kit, and what is sometime called an “alternate kit” or similar that will include a 2u and 1.75u shift.

The other way is look at sets that include more than 108 keys. So if you go on Amazon and see a kit with 120+ keys check out the photo of the tray to make sure it includes those four keys.

This one for example has 125 keys and includes both:

https://www.amazon.com/ONECAP-Original-Dye-Sublimated-Mechanical-Keyboard/dp/B07GDDTVVR/ref=sr_1_69_sspa?keywords=PBT+keycaps&qid=1558061762&s=gateway&sr=8-69-spons&psc=1