17613-216322-oil-filter-1948-54.jpg 34891-216322-g-oil-filter-1948-54-in-aluminium-with-changeable-element.jpg I see what you are saying . The 1st photo is the original type filter that Craddocks sell  which is a throw away unit & cheaper than the 2nd type that has an aluminium housing & replacement cartridge which is more expensive. The problem with booth types is to get replacements they may not be available in Australia & are more difficult to change were with the type I have the filter is available here & is easy to change. I can not see how how the cartridge type clamps together , if they are using the bracket clamp to hold it I think it would be a pig to change & get to seal but it dose look like an original. 
That is just my two bobs worth.
I just had another look at the Craddocks site , it looks like the bottom housing screws into the top housing  but could not find any reference to replacement cartridges unless they are the same as the ones in the 2lit filter from the photo they look the same size. ?????
 
			
		
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