Fitting new front bumper to Elan S4

[roebuck]

Hi,
I have a replacement front bumper from Paul Matty and now need to fit it.
Front of the car has had a poor repairs over the years and the old bumper had to 2 bolts for attachment only.
The bumper is also badly filled with some type of foam.
Do I need to fill the new bumper with foam and if so what product do I use.

In one forum it says that the S4 had a central attachment. On my car there is no sign of this.
Any help greatly received.
Rob