That mount kit might be the right one but like you said it only has one dog bone and it has the other style transmission mount which I'm not sure if it's the correct one to what yours has. the price is good but the mounts are probably cheap china parts. I would want OE mounts if it were my car.
I wouldnt go through the trouble and expense of replacing all the mounts. I doubt all of them are bad or you would have vibrations and the engine clunking all the time. I think the dogbones go out most often and can be checked by rocking the motor.
I'm not sure what is causing the vibration but I would inspect and pry on the mounts before condemning them.
You can tell if a mount is bad because it will have excessive movement and usually make noise when pried on or the rubber is torn or sometimes a hydraulic mount will leak fluid. With the dogbones if you rock the motor they may have excess movement and clank.
What I did to notice if my motor/trans mounts were bad was to engage the parking brake and put the car in reverse or drive and give it a small amount of gas and see how much the motor moves. I have my dog bone mounts flipped and brand new trans and motor mounts and my motor doesn't move at all when I test it like that. My trans mount had 178k miles on it and was terribly worn, but i changed out the motor mount as well as the trans mount and all vibration/movement of the motor is gone.
_________________ 2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
I have a 3800, there are two upper dog bone mounts as well as a motor mount that mounts the motor to the subframe as well as a transmission mount that as you could guess, mounts the transmission to the subframe and keeps it all together.
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