NP 914-6 GT Koni Rear Racing Shocks, External Dual Adjustable, OEM, NOS - Set #5
Koni Adjustable "Special D" Shock Absorbers. Made in Holland ~ PN 8211-1119 https://pbase.com/9146gt/image/154766154
Maybe not NOS, but possibly close to 'hardly used' https://pbase.com/9146gt/image/154766192 possibly bounced-around a lot in the last 40 or so years. The quandary now is, to restore or just leave them alone. I'll have to think about that...