My grill area is 50cm bit smaller that the weber have just sent email to smoke kings for the right combination
You want the complete set Steiny, from memory mine were close to $100 you will get 3 panels which clip together. Grill Grates
I store mine in a Weber 57, they fit it fine or can use 2 of them in the Traeger junior which has to be the smallest pellet cue made. I just checked my Performer 46 and they are about 5mm too long to fit inside it.