Pedal rod grommet does not fit in new Master Cylinder

I have a new master cylinder PN DBMC10 from right stuff detailing that says it work for both manual and power brake applications. I am going to try running manual brakes to see if i liked them with this master but the grommet does not fit! I pulled the rod out of the old master and and then pulled out the little grommet, well there is no recessed area for the grommet to fit into in the new master. Anyone run into this problem before?