Yes - If you are talking about the bits I think you are, they go vertically between the plate and the crossmember; you will find that these are needed because the middle tab that bolts to the body stops the plate from sitting flat against the crossmember.
The crossmember is sufficiently strong that it should not need reinforcing on the front although I think there should be thick washers there. Make sure the bolts are high tensile and as large as will fit in the holes. Cover them with antiseize - you may want to remove them at some time!
John
John

