Please note that you need to choose the variant of add-ons for Q1 Max ISO first, and then add to cart.
Palm Rest
Keycaps for ISO (EU) layout
These keycap sets have the variant for Q1 / Q1 Pro, and they all have additional keycaps for Windows and macOS.
Q1 or Q1 Pro keycap sets are compatible with Q1 Max.
Plates
Q1 Pro plates are compatible with Q1 Max.