Welcome to iRV2.
Most led lamps; that I've seen, like those you've pictured ; come as an assembly , led , lens and housing.
You mention the leds are not working , does the wiring check out , as functioning ?
Can you post a picture of the broken connector?
Are you in Europe ?
I ask because I've never heard of the RV you've listed in your post .
A search of the Fiat motorhome web site , didn't turn up any North American dealers .