Where are you located? I'm in Wisconsin. That rear glass is the same on most '69-'70 GM big body 2-door hardtops. I will be at a salvage yard later this week that has a few cars with that glass still in them ('69 Catalina 2-door hardtop and a couple of '70 Chev Impalas come to mind). Can see about price and getting one of them if no one here has anything. Most likely these would be non-tint.
This one appears to be tinted. (Blue / green type factory tint). The one we have is deeply scratched so we are looking for another in nice condition. Let me know what you find, I am in Omaha NE, but my father lives in Rockford IL if that helps.
1970 Buick LeSabre 455 Details Individual parts only (whole car is not for sale). Please note that photos may not reflect current remaining parts. DVID #: 70BU6274B Make: Buick Model: LeSabre Year: 1970 Body Type: Style: 2 Door Hard Top Lot: Black Canyon Price: Call to see if your part is still on the vehicle https://www.dvap.com/salvage/1970-buick-lesabre-2dr-ht-70bu6274d/
1970 Buick Lesabre Details Individual parts only (whole car is not for sale). Please note that photos may not reflect current remaining parts. DVID #: 70BU9176D Make: Buick Model: LeSabre Year: 1970 Body Type: Style: 4 Door Hard Top Lot: Desert Valley Price: Call to see if your part is still on the vehicle https://www.dvap.com/salvage/1970-buick-lesabre-70bu9176d/
1970 Buick LeSabre Details Individual parts only (whole car is not for sale). Please note that photos may not reflect current remaining parts. DVID #: 70BU1872C Make: Buick Model: LeSabre Year: 1970 Body Type: Style: 4 Door Sedan Lot: Casa Grande Price: Call to see if your part is still on the vehicle https://www.dvap.com/salvage/1970-buick-lesabre-70bu1872c/
1970 Buick LeSabre Arizona Car Details Individual parts only (whole car is not for sale). Please note that photos may not reflect current remaining parts. DVID #: 70BU1984D Make: Buick Model: LeSabre Year: 1970 Body Type: Style: 2 Door Hard Top Lot: Desert Valley Price: Call to see if your part is still on the vehicle https://www.dvap.com/salvage/1970-buick-lesabre-70bu1984d/
I had access to (past tense) this '69 Electra coupe for 3 1/2 years, but it is crushed now. More of a formal roofline doubt the glass was the same. Do still have a lot of good bits I bought from it.