Have both styles for sale.
The original cross-bar style is used and includes mounting hardware. This was on the car when I bought it so not sure where these were purchased, but kirban’s sells the same style
www.kirbanperformance.com
$40 + shipping
The newer ‘tin man’ version is new, only mocked-up in my car. Pilot holes pre-drilled in the marked locations, includes instructions and all mounting hardware. This was purchased from kirban’s and details on this part can be found at; https://www.kirbanperformance.com/product/416/GNX+REAR+SEAT+BRACE+#7169.html
$130 + shipping
The original cross-bar style is used and includes mounting hardware. This was on the car when I bought it so not sure where these were purchased, but kirban’s sells the same style
1978-1984 1985 1986 1987 Buick Regal Grand National Turbo T T-Type GNX REAR SEAT FRAME BRACE KIT #1586

The newer ‘tin man’ version is new, only mocked-up in my car. Pilot holes pre-drilled in the marked locations, includes instructions and all mounting hardware. This was purchased from kirban’s and details on this part can be found at; https://www.kirbanperformance.com/product/416/GNX+REAR+SEAT+BRACE+#7169.html
$130 + shipping