I believe (and some of you other guys feel free to correct me) that the vinyl lining inside the lockers (of my E35-3 anyhow) was just the same standard kind of vinyl that was used for the headliner - right?
I would think you could use the standard stuff like you get at a fabric store, no?
The big pain comes in ripping the stuff out - as it's glued to the glass - with a thin sandwich of foam padding - on the other side. So, you can rip it out - and then pick-pick-pick the bits of foam out
Also - do a search on 'headliner' as there are a number of project threads here that discuss the removal/replacement of the headliner (horizontal version of what you're talking about)
Guys? Can you add to this??
//sse