2018 Tahoe 2nd row, middle seat beats - help

[AJCK87]

Hey Guys,

Looking to integrate the middle seat belts, out of a 2018 Tahoe, into my 1965 Suburban 2nd and 3rd row seats. I have the belts, buckle assembly protector and bezel pieces, as seen in photo. My question is what does the bracket, if there is one, look like that? The piece that part 4, in the photo, would bolt to and that would hold the top section of the belt from pulling forward in a collision. Any pictures, schematics or info would help. Just tying to get an idea of the design or if there is a part out there that I can make work in my application. Thanks