These spark plug boots were designed to fit R.B. Motion spark plugs but will fit over other pegs that are similar in size found under the heading "Plug Side Bore" for all boots listed here.
They are molded in a silicone type rubber in a 'STRAIGHT' style configuration. Holes are molded into both ends of the boot for easy installation. Slight trimming of ends may be required to remove "Flash" at ends or to adjust lengths to your requirements.