we have had this part for quite some time now, works perfectly but made from a silicone mold because there is not enough demand. Who knows what it is?Click to view attachment

The plug that goes on the long-inside the cabin?

Yep, I agree, long plug.

nope, you six guys will know though. The oval plug on the longitudinal is actually an oval floor pan tar piece

Doesnt it plug the fuel line holes used by the /4 cyl engines, when ising a /6 ?

Oh please.
It's to fill the extra fuel line hole in the engine tray below the battery.
The 6 has no return line.

Ah!

That was hard to tell, couldn't really make out the size of the little suckers.

YES! Standard equipment on all 914-6 models, discontinued by the factory, also used when using only a single fuel line up through the engine shelf

All I see is a really dirty desk