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This old thread from TDPRI indicates ABS or vinyl or PVC/ PVA!http://www.tdpri.com/threads/pickguard-confusion.117900/This rather excellent (if dated) site says ABS or vinyl.http://www.guitarhq.com/fender.html
Noone, to my knowledge, uses the correct materials but Callaham parts are close to the right look https://www.callahamguitars.com/tele_pickguards_catalog.htm
I sell them for £12 delivered.http://www.amberguitar.com/pickguards/281-single-ply-white-pickguard.html