1972 Dodge Colt

I spent most of my week on the phone getting parts on order.
I am rebuilding the rear KONI's with as many new parts as I can find.
Bearings for the mounts, rebound bumpers, paint, etc.
They still list these shocks, only now they are aluminum.
Maybe down the road if i want to save 10 lbs. and spend a thousand dollars I will think about it.
The date code on these is Nov 1982.
Anyone know what they mean by "HEAVY"?
That is what is on the adjuster knobs.
Rear Konis (5).JPG Rear Konis (7).JPG Rear Konis (8).JPG