Hello,
It would be silly not to chime in here. As Wally said, I have been at Remmele's end of May this year and I was told that he wouldn't sell the heads seperately. All due to problems that some other builders encountered and had blamed the heads for. Maybe he was just in a "no-sale" mood when I was there.
Well, I guess David has a better relation with mr. Remmele so he probably has the best info. I can only say what I've been told.
By the way, David did you clean your old black cup-car in the meantime? It was looking a bit scruffy with all the dust on it parked outside Remmele's shop!
Cheers,
Richard