2.5TD Fuel filter assembly

[Seth]

Vauxhall tell me that there are two types fitted on the 2.5TDs.
Can anyone tell me how you identify which is which?
Are they interchangeable, and has anyone got one?
Vauxhall quoted around £75+vat whichever variant is required. None in the country either!!!!!

[TheBoy]

Don't know specifically about fuel filter housing, but most changes came between U25DT (no MAF, metal oil filter cap) and X25DT (MAF, plastic oil filter cap)...