I just did mine on the passenger side- car was sitting for 30+ years. Broke the front one, but enough of it protruded that I could pound the bolt through the bushing. I also used a prybar between the bold head and the frame tab. The rear one was also frozen, but responded well to heat with rapid cooling. I took my time with repeated soaking with SiliKroil, too. These were as bad as I can imagine but still got em without cutting.