Guys, thanks, lots of help...I realize now my question is really about sourcing the "bitumen board" the car is lathered with...I see rubber-backed felt commonly available (as throw-carpet backing), but otherwise it seems that Bitumen board is used mostly in construction (esp for expansion joints...). I had used rubber for the engine left/right.
Nate, yes that carpet from 1076 is the passenger side---another obsessive difference, the left/right carpets on 1076 were single piece, apparently glued to the felt/bitumen board in the foot area and secured by the seat track bolts in the rear section (the foot rest area was not separate and the carpet could not be removed without removing the seat). The second picture I posted is from the 'carsanddogs' 2-headlight car in Northern California that was up for sale a few weeks ago on ebay, showing 2 piece carpets and the carpet fasteners you see in the bitumen board. 1076 did Not have mats, good question whether (esp with easily removable front carpet sections).---Lee
