the roof skin is the same (but then they are the same from 59 to 2000), so it doesn't have to be a specific mk1 item.
if you want the 'top chop' (for want of a better description!) with the intention of letting the roof, cant rail and pillars onto your shell, then you will need to be careful as an elf is different to a normal saloon.
the front pillars and 'b' pillars are the same but it all goes wrong at the 'c' pillars. they are a one piece pressing, not two joined by the seam like on a saloon, then the one piece pressing is joined round the cant, so the cant is a separate bit as well, its all lead loaded, so you cannot see it.
I suppose you could use it on a saloon, but you would either have to deseam it (

), or try and weld a lip onto it to hold the seam finisher.