This is the V8 Engine mount BRACKET set ..LH & RH.
Your engine mount slips over this & the bolt goes thought it.
Bracket head size is 2 5/8"... not the smaller 2 3/8".. most 58-64's used 2.5/8"
Sold in pairs only
This is whats also needed if changing from a 58-59 6cyl factory in line 6 to the chevy small block.. otherwise the tilt of the SBC will cause a rumble in the tail shaft drive line thats annoying.