Diaphragm material, still available??

[BCA]

Robin,
The format of your part numbers indicate that they likely represent a transition numbering system used from the mid-1940's and possibly as late as the mid-1950's. Apparently an attempt was made to assign a standardized or "neutral number" (hence NEU as part of number) to numbers used by the wide range of military suppliers.
Since this numbering system is quite dated then the material referred to would not likely be suitable for modern fuels. I will try to trace these numbers in a cross-reference book and maybe come up with a manufacturer's part numbers.
As discussed in a previous thead it would be interesting to hear from anyone with more information about this little-known numbering system.
...... Brian