Hasselblad 40mm C T* Filters?

[cpark]

I am sure this has been answered already, but I have done a lot of digging trying to find out what my filter options for the older style c lenses are as far as filters are concerned. I keep coming across claims that the bayonet 104 fitting is the same as the bayonet series viii(8). I then can find other sites that state that in fact the series viii filters are quite a bit smaller.
Are bayonet 104 filters equal in size to the bayonet series viii filters?
If not, are there bayonet 104 filter equivalents?

 

[coa_lund]

The Distagon 40 mm lens takes filters 104 mm in baynet mount. These filters are quite difficult to obtain.
Hasselblad swa, swc and distagon c 50 and 60 take series filters ser. viii = hbl ser 63.
Carl