Whitewalls - Whitewalls SA, Derel 0427 715380. He will come to you and do them with the wheels still on the car. Last I checked $120. A few other guys in Adelaide are also doing it and I have seen work by all of them. At this stage I cannot recommend anyone else as they are all yet to perfect it like Derel has. They will get there though and then there will be some competition for him.
Flappers - Antique Motor Spares, Wingfield 8268 5540. John can supply Flappers from 12 to 15inch. Price is somewhere between $150 to $160 for a set of 4 last I checked. He can be found at pretty much all swapmeets too. He stocks "Atlas" brand flappers which from my experience are the best.