In the past on dirt track cars I have used a turn buckle with locknuts that way you can tighten it and lock it where you want it. The car ripped new mounts off in a week or two and I didn't want solid mounts. I just went to a good hardware store and found what I needed and welded a bolt to the frame and attached the other end to a head bolt with the ground stud. I used that setup for 3 years and it worked flawlessly.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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