The larger of the NEMA electric box blank plates (The reg is 4"x4"; the big is 5x5?) are under $1 at a big box hardware store. They have one hole in 2 corners, meaning I can tie a LONG, bright yellow string to wrap around the throttle so I won’t forget it. Thick galvanized steel, they make a loud clank and spread out over really crappy ground. (+800lb K1600)