[BR3W CITY]

I don't think that one actually replaces the perch. The larger plate bolts to the motor, and the small single hole unit mounts atop the perch in place of the old SBC mount lower bolt (which is a single bolt)

If I undersand it correctly, that IS the mount, you don't stack another with it. There's good and bad to that...I have no idea how you would rebuild the centers if they wore out, unless you can just go find a poly suspension bushing that fits the sleeve.