I was in a good mood, so I compiled some info that I had on OEM floor mats.
US models 2011-2019


Disclaimer: Seeing that we are at least 10 years past the release of the 2011 model, I cannot guarantee availability. I only provide these numbers for reference.

One thing I have to applaud Infiniti for, is the vast array of choices, especially in the earlier models. This is the sign of a brand that is trying...otherwise it would have been pretty easy (and more economical) to make one blank set of mat that would fit all the models.
Instead, we have 12 different options at our disposal; and that's not even accounting for all the different color options.

Another thing to note, is that all these part numbers are sold in full sets for all 4 outboard seats.

These are the options for those that wanted their mats to carry the M37 logo.
Carpeted floor mats
G4900-1PM1E black
G4900-1PM1D beige
G4900-1PM1F gray

Premium carpeted floor mats
G4900-1MA4B black
G4900-1MA4A beige
G4900-1MA4C gray

Rubber all season floor mats
999E1-QY000BK black
999E1-QY000BE beige
999E1-QY000GY gray

If you wanted your mats to be engraved with the M56 logo, here are your options.
Carpeted floor mats
G4900-1PM3E beige
G4900-1PM3D beige
G4900-1PM3F gray
G4900-1MA3E black

Premium carpeted floor mats
G4900-1MA5B black
G4900-1MA5A beige
G4900-1MA5C gray

Rubber all season floor mats
999E1-QY001BK black
999E1-QY001BE beige
999E1-QY001GY gray

For the M hybrid, fewer options but options nevertheless.
Carpeted floor mats
G4900-1MA6E black
G4900-1MA6D beige
G4900-1MA6F gray

Rubber all season floor mats
999E1-QY002BK black
999E1-QY002BE beige
999E1-QY002GY gray

The short wheelbase models share part numbers. This applies for both Q70 and Q70 hybrid
Carpeted floor mats
G4900-1PM8E graphite
G4900-1PM8D wheat
G4900-1PM8F stone

Rubber all season floor mats
999E1-Q2000 black
999E1-Q2002 beige
999E1-Q2001 gray

Since the long wheelbase model has considerably more rear legroom, it needs special rear mats.
Carpeted floor mats
G4900-6AE0E graphite
G4900-6AE0D wheat
G4900-6AE0F stone

Rubber all season floor mats
999E1-Q3000 black

Carpeted trunk mat
999E3-QX000 M series, old part number
999E3-QY000 Q70, old part number
999E3-QY010, replaces both part numbers above