Light bulb replacement

Orior

I will shortly be setting off on my first ever caravanning holiday and need to get replacement bulbs just in case. My caravan is a Lunar Quasar. In the manual it says I need 5W 12V and 21W 12V bulbs. Are they a standard bulb you can get in any car accessory shop?

Also it says all my internal light bulbs, which are LED, are non-replaceable. What does that mean? If one goes do I need to get a whole new light unit?