I doubt very mich if there will be any aftermarket parts for this kit. It was originally released, along with a Camel and a SPAD, back in the mid 1960's. It seems to be one of those being re-released under the 'Classics' banner by Revell.
I haven't built this kit, but if it's anything like the Camel, which, at the time, was very advanced, the kit detail should be rather good, if the moulds haven't suffered, and additions should be minimal and fairly simple to scratch-build.