Datsun 1200 came with carpet covering the transmission tunnel in the front seat area. Rubber mats cover the floor.
Overview
The carpet was a blue/back or yellow/black houndstooth pattern:
Upscale GL and GX models had a 'foot patch' on the tunnel carpet next to the clutch pedal.
carpet profile
Parts
Tunnel carpet is NLA (No Longer Available) from Nissan in the USA, Canada and Japan.
AUS: Knox carpet fits the automatic tunnel, is a bit large for the standard manual transmission tunnel and will gather about the gathers at the sides near the doors. Fitting an extra layer of insulation will help.
AUS: Trufit
USA: Order custom carpet from ACC in Alabama http://www.accmats.com/Products/Flooring/Material.aspx
Insulation
From the factory, only the tunnel had insulation, a jute type. Additionally there are some asbestos heat shields on the floor.
Fitting carpet insulation will significantly quiet the 1200 cabin.