I too had a Kavan 1975 I believe Kavan Jet Ranger parts are around but hard to find. This was my 1st scale project I bought from a local hospital administrator that had no time to complete. He had 4 NIB kits and the JR was completed all but paint work. Parts are fairly scarce I'm afraid...
On any heli I fly daily I try to make sure parts are readily available just in case....