Anyone using either Jegs GS-1 or Summits G1159 seats in either a '69 or '70 fastback? I have also been looking at the TMI sport seat upholstery for the '69/70 Mach I seats. I'm most concerned with both the seat bottom height and the seat back height. Right now my stock seat sits higher in my '70 than my friends stock seat sits in his '69. My legs hit the bottom of my steering wheel and I don't want the seat backs to look too tall. I know that some people have cut down or removed the seat platform and I may have to do that as well. Any advice/pics would be helpful. Thanks in advance.