I've never had anyone ask for larger ones. I think the same 4mm would work just fine though. I would imagine it also depends on the type of vehicle they are going in as to which you would need. They just sit on like the radiator area, and by the hook for the hood latch on the hood. The idea is to have them bend some to keep in place. So I would think larger vehicles would use the jumbo ones then especially if the hood opening is larger. We have just never ran across people asking for larger ones. Possibly could be that if the ones we make don't fit tight enough, they just use another vehicle. Sorry I couldn't be more help on those jumbo ones