rear brake line flexible hose mtging bolt for 69

[enio45]

working on a 69Z and wanted to find the correct bolt that holds the T block on the flexible line to the bracket that is attached
to the rear end housing. Upon doing so - I discovered a few things.....

1. it is a special bolt that has a shoulder on it
2. The org bolt (which I found at a buddy's place) does not fit in the today brake line (got mine from in line tube)

Anyone come across this before...the bolt is not listed in AMK and looks to be a one off for the car. Also - does not seem that
anyone makes this bolt with the shoulder on it and they just use a reg bolt without the shoulder.

Hope this was not to confusing...

Appreciate any input or your experience with this.