The GNX replica frame brace is no longer made or available, but sometimes for sale on E-bay, and was a fore-runner of the current style of rear seat brace made and available today. If you buy one, make sure that you get instructions for drill hole locations. The current one sold by Kirban Performance works just fine, and Imho is instrumental in avoiding the dreaded roof line cracks that develop from structural fatigue.
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This one:
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Part #7169
1984-1987 Turbo Regal - Reproduction GNX REAR SEAT FRAME BRACE KIT
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1984-1987 Turbo Regal -
Reproduction GNX REAR SEAT FRAME BRACE KIT
This reproduction GNX-style rear seat brace is very similar to what
ASC installed in every GNX. The idea was to strengthen the body of
the Regals that received the GNX upgrade.
This reproduction brace is similar to the original GNX rear seat
frame brace, but is slightly wider. The brace is made in 18 gauge
galvanized steel, so it will not rust. The ears on the ends are
doubled over for additional strength.
Each brace comes with easy-to-follow detailed directions with photos.
All the hardware, even the actual drill bits, are included to make
this installation easy.
This new brace will work with the partial rear seat brace kit, but
you will have to completely remove two of the four rear seat braces.
Unlike the rear seat brace kit we currently sell (PART # 1586) that
bolts to the rear seat frame, this new brace bolts to the trunk floor
pan and the trunk gussets for added strength.
Because the brace kit is an oversized item, the shipping charge is $20.
7169 1984-1987 Turbo Regal -
Reproduction GNX Rear Seat Frame Brace Kit $129.95 / kit
Fits: 1984-1987 Turbo Regal
Price: $129.95
Shipping Weight: 8 lbs.
Oversized: Yes