No, but you have to be sure that no rubber pieces shear off the old grommet and enter the pan. When I replaced mine I was prepared to pull the pan, but even though the bottom of the grommet came off in the bore, I was able to remove it with needle nose pliers.

I had to seat the lower tube with slight taps before it would seat completely. Once the assembly was completely installed and bolted, I pulled the lower tube up slightly until it mated completely into the upper tube.