dn29626 wrote:Yes, i am sure that is what the parts counter guy told me at the local Nissan dealership.
Well, you might try a different source.
The first one, 
33006, is only 20 micron, which is pretty darned fine for a fuel prefilter.
I can't recall if, on the 300D, this filter is on the suction side of the lift pump.  If it replaces the "cigar filter", I would think it would be OK.  But I'm suspicious of that 20 micron rating.
The second one, 
33007, is explicitly a wire mesh screen and has a rating of 50 microns, which is pretty fine for a wire mesh.  I'm sure it would work just fine at a 720 diesel prefilter.