[Top Down]

     

What are these red things called (not the guide!) and where can I get some please? 

I have several second hand cars where the previous owner lowered them by deleting these but the tyres rub the arches so I'd like to replace them but without knowing their name, how CAN I find them!

If they're not available separately is there a reasonably priced alternative I could try. I seem to recall mention of Neoprene or silicone? O-rings to damp out vibrations. Source? 
    
Thanks in anticipation.