Although I am not selling, I just rechecked my NOS EB 1977 backglass on the wall.
It has no mirroring for reference, which in this case is a GOOD thing for many reasons so I can provide a recommendation.

Contact Stephen Azzam <[email protected]> at BGRESTO.com
They have already have the artwork for this backglass and have done it before.
They will be able to provide a near spot on replacement for less than a reproduction or original glass (including shipping) in 4-6 weeks.
Probably around $280 total.
This is an actual backglass although it is not ink screened like the original or CPR reproduction but a vinyl vacuum form style similar to what Stern is doing today.
The quality is EXCELLENT, but a little darker than the original which can be offset with LEDs.

If you want to wait, Shay has this on his "hit list" in the future based on approvals with PPS.
Alternatives are to "shop around" as they periodically show up at the most unlikely of times.
Recently, in the last couple of months a few repos were available, but the ones I was aware of are now gone.
Rick at PPS had a couple in his inventory, but they had flaws or were damaged.

Make sure you know what version you have, the CPR will not fit in the 1984 version of the game as it slides in vs lifting out.

My bad, I thought you were looking for a eight ball deluxe.