Identify what vehicle these parts are for

I have 2 lower spring brackets that bolts to the u-bolt holding on the rear leaf springs. It's also where the lower attachment for the rear shock absorbers mount..

Part # 3400 836 & 3400 837
there is a number below, 46522, on each.

Any idea of the vehicle they are for?

Thanks
Frank

E Body 1970 8 3/4 dana

Thank you