That hanger bracket can be sourced from a 1969 Mercury Cougar.
That sequential box bracket, was brazed onto the Cougar trunk floor. Similar bracket was used on 1970-73 Cougars, but evolved. By 1970, a modified bracket with a step was introduced to 'make a gap' for the sequential box to hang.
We also see variations on the spacing of the installed bracket in 1969. 1969 version on the right.
That sequential box bracket, was brazed onto the Cougar trunk floor. Similar bracket was used on 1970-73 Cougars, but evolved. By 1970, a modified bracket with a step was introduced to 'make a gap' for the sequential box to hang.
We also see variations on the spacing of the installed bracket in 1969. 1969 version on the right.