Hi,
Field coil might be difficult to source.Altec RCA,JBL Alnico drivers and woofers can be found with a little bit of leg work.
Please see my other post on the Single driver thread.
There are some Altec 288C drivers ,416 woofers and RCA/VICTOR(made in Japan under licence from RCA)MI9584 drivers with some dealers I know but they are asking for pretty stiff prices.
I have bought the same for prices ranging from a few hundreds to less than Rs.1500/ so current pricing seems crazy to me.
To give you an idea you will be looking at a total outlay of around $ 750-$900 for a pair of 416 woofers and a pair of Altec 288c drivers.This is including restoring cost with new parts from Great Plains Audio .
The Victor/RCA's should work out to around $250-$300 a pair.The diaphagrams seem OK.
If you can come down to Madras I can put you in touch with these guys.
Regards
Rajiv