Installing lift pump 300TDi

Hello Folk,
I'd appreciate a view from anyone with more experience of these things:
The new lift pump I'm about to install came with two gaskets for the pump to c/case joint, both the same shape. Are the two supposed to be some sort of spacer arrangement to get the right load on the cam eccentric or should I just use one?
The pump is Britpart 'OEM quality', apparently indicated by a suffix G to the part number. Does anyone know whether this really is a different (?better) quality. Or, as I understand from previous threads, is it just a slightly less c**p quality than the normal stuff.
Puzzled........
Rob.

There is an answer but I don't know it.
I would just use my common sense and hold the old and new pumps together and select what's needed so the arm protrudes the same amount from the block face.
Test the new pump sucks and blows using your thumb over the relevent ports before you fit it- I had one that was faulty from new and one that had an incorrectly made arm that didn't even touch the cam!

you dont need the spacer when fitting to a 300 tdi ,other engines will require the spacer ,g is ok quality wise

Make sure you got the nuts and olives with the pump too.

The OEM Delphi ones have a removable top with a mesh pre filter. The aftermarket don't seem to.

Thanks All, very helpful comments.
The pump did come with sleeve nuts and olives but I was going to run new 8mm rubber fuel hose clipped straight to the pump and run direct to the tank in order to see what happens to my 'air-in-fuel-problem'. I'm told chafing of the nylon pipe where it goes over the chassis is a good possibility with the resulting pinhole impossible to spot; apart from which there is a short splice of rubber in the nylon pipe in that area, fitted to extend the pipe to fit the 300 when it was installed, so more joints than is healthy really. As for duff replacement parts well................forewarned is forearmed.
Rob.

Make sure you get the pipes back on the right way. Numpty here got it wrong once. Engine ran fine up to about 2500rpm. Took me days to figure out what I'd done wrong.