I had to cut all the mounting brackets off the GTO seats so I was left w/ bare rails, fabbed up some custom frames so I could use the original mounting holes in the Tahoe floor, and welded the frame to the GTO rails. Followed that with a little paint and brackets for the factory plastic trim pieces. What a write up, huh? "All ya gotta do is..."
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Let me know if this is something you'd like to do and I'll get more specific. FYI, its not something I'd do again