How would i make this machine change parts into meshes?

I made a machine that would change the anypart that touch it into a fedora but i want the machine to change the mesh to a tophat when a part touch it and i want it to do this pattern over and over here is the script. I Tried

B = script.Mesh 

function onTouched(part) 
BC = B:clone() 
BC.Parent = part 
script.Parent.CanCollide = false
then
wait(0.2)
script.Mesh.ChangeMeshId.http://www.roblox.com/asset/?id=162384581 
script.Mesh.ChangeTextureId.http://www.roblox.com/asset/?id=162384608
BC.Parent = part
script.Parent.CanCollide = false
then
wait(0.2)
script.Mesh.ChangeMeshId.http://www.roblox.com/asset/?id=------NEW ID
script.Mesh.ChangeTextureId.http://www.roblox.com/asset/?id=-----NEW ID
----THEN IT WILL DO THIS OVER and OVER
end
script.Parent.Touched:connect(onTouched) 

You need to do this:

script.Mesh.MeshId="http://www.roblox.com/asset/?id=162384581"
script.Mesh.TextureId="http://www.roblox.com/asset/?id=162384608"

There isn't any instances or anything like ChangeMeshId or ChangeTextureId When you change something like a texture of a decal or mesh, it needs to be in a string.