"B" Series oil filter

[Richard Coutts-Smith]

According to the Champ site the Crosland 432 oil filter will fit the range of Rolls Royce "B" Series engine. This is all well and good but the part No. is obsolete in Australia, and after spending hours on the internet seems that with one exception (Khaki Imports in USA) they are not available elsewhere. (Sounds like Croslands themselves are no longer as well?)
Does anyone know of another suitable filter?
I know that there is an adaptor for screw on filters, but have been told that while OK for the B40, they do not cope with the oil flow in a B60.
What do all you Ferret guys use?
Marcus Glen stock the original style, but I would prefer something closer, and I imagine that they will not be cheap.
last time I asked Tim Vibert he only had Moth Eaten (I mean this literally) originals.
Any help whatsoever will be most appreciated.....
Rich.