I am 99% sure. make sure the compressor is not left running or you will need to replace it too. You should be able feel the rip in the bags. Sorry to say they are not the best Considering what they cost.
I tried coilovers in a 430 years ago. 3 failed in 700 miles. I put the air shocks back in the front and got lexus standard shocks for th rear. Car handled great.
Any high end car scan be a money pit as they get old. Sometimes it the luck of the draw. My 400's only needed servicing and a few other bits and pices where as the 430 a money pit.