Building my X5

[cutting edge]

I am just building my X-5 and i have got to the point of fitting the rear bumper which fits but the rear brace does not it falls off

I know there is no mention of the brace in the instructions but it was included in the kit and I feel it is needed on there or is it not ?????

Help please i was very happy with the build up to this point the transmition is as free as a bird