when i did the clutch on my a15 racer (60 series 4 speed) i talked to the blokes at exedy and he told me that the vannette and all a12 and a15 clutches all cross reference to the a12 one anyway. that bloke wasnt too helpful and sugested a clutch suited to the direct opposite use i wanted it for anyway. (one of the purks for working for supercheap auto)
when i upgraded to the 63series 5 speed i took the gearbox and flywheel and thowout bearing to the local clutch specialist. it took them a week and i had a fully custom built cerametalic 5 puck cushion button clutch and pressure plate for the sum of $340 including a flywheel machine.

my A15+ FS5W60A setup using 160j clutch plate and cover. A15 flywheel was machine and new hole n thread was made to fasten 160j cover. minor mod to withdrawal lever needed. this setup was good compared to original setup, less clutch slip.

I've always bought a brand new clutch Kits from Repco, cheap as chips <$100 and have had no stress at all, unless your going massive HP and are into rev-dump-baggit gig..