I cannot say I have ever seen a B4 GLX that was NOT leather. Come to think of it, I cannot recall ever seeing an A3 GLX that was not leather either.
The question is, is the car indeed a GLX, as I cannot for the life of me remember if all VR6 B4s were GLX or if they had a GLS with a VR6 option.
At any rate, the leather in those cars was awful durability wise. The bolsters were nicer though.
Volkswagen did not have many choices in cars for this market back then.