Body mount problm

[mprat]

I went to put my 67 chevelle body down on the frame this morning and found the two center rubber mounts won't fit in the holes in the frame... am I doing something wrong. All the other ones fit fine but the two holes center of the frame are smaller and the rounded out rubber is too large.... I thought they just all sit on top like the rest..... befor I do something stupid I thought I would ask for some help to those who have done this before...... thanks.... larry