There is reproduction glass available, but if you care more about authenticy than perfection, you might be interested in this. Includes wiring sub-harness.
I have not been able to decode the date on the Triplex stamp but photos are included. It was removed from a boot lid marked with 50485, likely the the last 5 digits of the chassis number.
Application: Jaguar E-Type Series 1 3.8, E-Type Series 1 4.2, E-Type Series 1.5, E-Type Series 2, E-Type Series 3