Quote Originally Posted by TLSheff View Post
I would speculate that you have something wrong with the car, if you keep breaking the aluminum mount.

My reason for saying this is, that mount is the same for all years 97-08 with the 3800. L36, L67, L26, L32 they all use that bracket. So it has to be something causing it to break, not just the mount. People with high power motor builds still running on the stock brackets don't have problems but your basic bolt-on NA motor breaks them repeatedly.... something is wrong here.

Should you want to look for a LS4 bracket, it is also Aluminum, likely to break the same, but look for a GXP car 05-08. Or search for part # 10306033.
The proper bracket for your car is #24503458.

While the brackets look similar, not 100% the bolt pattern is the same and will allow it to bolt up, but you're welcome to try and let us know if it does.
A bunch of guys on clubgp used the ls4 on their builds however these were 450+whp from what I gathered they were bolt in but I think I know the op's problem don't tourqe the **** out of the bolt that goes to the dog bone mount those ears start to bend just enough to cause fractures and you will snap the ears everytime