There are several common skylights used by installers, and we'll list them below. Caravan/motorhome breakers is a good place to start for parts or replacements as these are quite expensive.
🕸 https://www.dometic.com/en-gb/outdoor/motorhome-and-van/motorhome-windows-and-blinds/motorhome-and-caravan-rooflights/dometic-midi-heki-style-156842
Install and Parts
🕸 https://www.remis.de/mobil/en/home
REMIFlair
REMIForm
REMItop Vario 2
REMItop Vario 2 - replacing protective tube
REMItop Vario 2 - Instruction
REMItop Vario 2 - Assembly instructions
REMItop Vario 2 - Instruction sheet
REMIbase - Assembly instructions
REMIFlair IV - Assembly instructions
REMItop Vista - Assembly instructions
REMItop Vista - Instruction sheet