Corner Shelf Bracket Sleeve - Parametric

Is there ever a time when you have these metal corner brackets propping up a shelf, but are maybe just a few millimetres too low?

These sleeves will slide right over the bracket to bump up the shelf! These brackets may or may not all be the same size, so I've included the Fusion360 file and set up everything as parameters.

There are two types I've made - one is completely flat, while the other has a little tab that hooks around the shelf (if there's room) so it's more apt to stay in place.

You'll need to delete the last extrusion step in order to create a flat spacer in this F3D file. The parameters don't allow me to set the measurement as 0.