I do not have a circuit for that crossover.
What I do know is that is a simple second order high and low pass.
This forms a composite fourth order filter when driver slopes are taken into account. So there should be two inductors and two caps in each crossover. The caps are polypropylene type and do not need changing.
I suspect the parts are factory. The voltage is not important and just has to be adequate. So whether it is 50 or 100 volt makes no difference.
A difference of 8 or 10 mfd will make no audible difference, and I suspect Celestion used what was available.
Components in crossovers are usually heat glued to the board to stop vibration .
There is a lot of miss information on the Net about these speakers I see.
There are claims of a complex crossover and notch filters causing close to a short circuit. This is all nonsense.
The drivers were designed to be well behaved, and the simple crossover works well.
They are small sealed speakers and they are down by 6 db at 60 Hz and so will be 18 db down at 30 Hz.
They would really work well crossed over to a sub at 80 Hz.
The most reliable information I can find for you is John Borwick's original
review in Gramophone.
My advice still stands, leave those speakers alone. You can only spoil them.