Rear A body KYB Shock

I have an extra KYB rear shock that I bought new from Rock Auto last fall for my 67.
I installed all four and had rattle in the back right side and I thought it was the shock. So I just bought another one from Summit so I wouldn't have to mess with Rock Auto's return hassle.
Turns out it wasn't the shock but my Crager SS rim.
So I have an extra one for sale. I'll take $20.00 for it plus the shipping cost from 48182.
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