Lexus RX 2004-09 :: Exhaust Rattle When Going Over A Speed Bump

I have recently started to have the exhaust rattle on my RX330. It occurs every now and then when the car is on an angle or more particularly when going over a speed bump. I had been trying to find out where it was coming from and it looked to be the exhaust possibly touching the plate that separates the exhaust from the spare wheel cover (which of course is plastic). This is the part I am talking about....

Now the first part of me thinks that to resolve the issue it would be handy to put some padding there to stop it from rattling against the shield when the exhaust does move. The second part of me also thinks, it might be time to replace the rubber holders as they seem to be particularly soft and have quite a bit of give to them. Now for the interim I would want to put some padding on there. What padding have to put there? Would exhaust wrap be the most obvious choice to wrap around the shield?

Trying to find an inexpensive temporary solution. The long term resolution would be for the actual rubber rings themselves to be replaced as well as having that small metal bit covered in some sort of wrap to prevent metal to metal touching (hence vibration and noise). Part of me also thought to remove the shield altogether, but worried that the exhaust may touch the plastic around the tyre and cause it to melt and possibly catch fire, as it does sway a bit.