The source as far as I know is original; however, there is another problem which should be bourn in mind.
That is, Carver sold a 'burner module' which included the burner of course but installed and tested, they never sold spare parts for the module including said burner. This fact could have alsorts of permutations should something go wrong!
So to install a burner might seem a big saving on buying a complete module,the problem lies in fitting it correctly so it's safe.
I've set 100's of them up on the bench where I can see what I'm doing and know exactly what I need to achieve. I can say that what would appear to be a simply job is actualy not? The relationship between burner and spark igniter is critical, 0.2mm can be the difference between perfect instant ignition and a BIG bang!!
To sum up then, be warned