Scaling an object from 3D warehouse

I downloaded a mailbox. How can I make it (or scale it ) shorter to an exact height?

depends on the mailbox.

if it is a live component, by double clicking on it you’ll see what changes are available.
if it’s a regular component, you can either squish it or properly modify it.

to squish, grab it, grab the scale tool, and scale it from it’s middle top grip. that one will only scale on the Z (blue) axis. using this grip, if you enter a dimension WITH the unit, it’ll scale to that size.
for example, 1,3 will make it 30% bigger but 1,3m will make it exactly 1,3m tall. careful, it will distort the model, and the dimension will be applied to the whole bounding box.

to modify it, enter the component, check if it is made of subgroups / components, enter and modify what you need. You’ll probably have to make the support post shorter, and then to move down the actual box.

again, it depends on the model you’ve picked.

post the model and required sizes, then Pierre or someone can give concise method.

Thanks very much!