I believe these are the charcoal canister and fuel breather pipes travelling to the fuel tank from the back of the car/fuel filler, hence the reason they are protected by the armouring plate that sits in the osr wheel arch.
Both the armouring plate and the tube that passes the pipes inside the car under the rear bench have corroded away on my 75. The bend sits slightly lower than the entry/exit points so will collect a small amount of water leading to corrosion. Not a great design, but I guess has lasted the average age of a car.
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