1970 911E

I need to change the rear shocks and was wondering if the Koni's (80K-2088) were the "OEM" shocks as I want to keep the car as "OEM" as possible.

Also need to change the rear window seal. Was this one installed incorrectly? Any difference in quality and fit? I saw some priced at $65 and others at $131.

Thanks!

JC