First off, I bought Trans Dapt #4213 for my 2.5 and they clearly won't work. One is too narrow and the other is way too wide. Compared them to my neighbors 4.0, and it's the same thing.
So what's the difference between the 2.5 and 4.0 motor mounts and what is another fairly inexpensive other than stock rubber replacements? I know the rubber mounts are really cheap but I want something pretty sturdy without spending a lot of money.