TD4S Auto Fuel Pump

Help.
I am totally confused. I have just taken off the Tank Fuel Pump on my 2000/2001 TD4S Vin number 11A588228 and all it had attached was a paper label with what looks like the following numbers
WFX.01230 and on the bottom of the label 0045882230. Now I have quoted these numbers to a number of Companies selling new Pumps and not one of them recognises these numbers. I need a new Fuel Pump but I do not want to put the wrong one back in. Does anybody have any idea?
Brookwells of Devon tell me a WFX500070 will fit
Rimmer Bros tell me a WFX100980 will fit.
Are they both correct?
Please help if you can

chassis 1A340904 to 2A209830........WFX500070

a search for the other no. comes up 'no match found'

Thanks Chaser.
Have now ordered the Pump. Hope it"s not too difficult to fit.