I am in the process of doing my bushings too... and noticed the subframe bushing is loose without the outermost shell. I seemed maybe 2mm too small. I went all over town looking for something to replace it with since the original was destroyed when I hammered them out. Luckily, a 2 1/2 inch exhaust tube (expanded side) was just the right diameter. Now the bushings are a perfect fit. Damn... I wish I had searched more thorougly before I started mine so I didn't have to run around all over town.