Rear bumper help (UK)

[Lowlifedub]

Hi guys,im after a bit of help if possible.Im awaiting delivery of my 72 C10 Fleetside from North Carolina(currently on the ship in the container)
I only have pictures to work from now and as it's a project im trying to get a few things in place before it gets here.

The rear bumper doesnt seem to look right.It looks too low and seems to be a large gap between the tailgate and the top of the bumper.

Is there a make up piece I am missing or is the bumper not for my truck year or is it a badly fitting aftermarket one?

I do like the look of the exhaust cut out LMC one but while im doing the bodywork id like to make this one fit better.

Thanks in advance guys