I do not know what is commercially available in your area, but you can make your own to fit out of sheet metal or that metal flashing stuff for roofs, you can get that at any home improvement type store. Also, any metal working shop should be able to make one for you to size. Usually a cone shape with a flair around the bottom to attach the wire too. Just cut it too size, and rivet or bolt or wire etc it together to fit where you want it. It is usually easiest to drill holes around the outside edges to wire the hardware cloth on. Since you are using it for predator protection (racoons?) you will want to fasten it pretty solid and make it tight to the tree, so you will have to adjust it every couple of years to give the tree room, if you leave some overlap on the metal you can just loosen it to make it bigger. Other common problem is if the tree is pretty even in diameter, you might have to put a post or two near there to support the hardware cloth and baffle at the height you want it, but since you are covering the top of the run, I assume you have some sort of frame work up anyhow.
