A package of ten, 90-degree, 3D-printed, spark plug boots, ideally suited for the distributor cap (see photo).
Enough for eight spark plugs boots at the distributor, plus two boots for the coil wire.
You will need another set of boots for the spark plugs at the head. The 45-degree boots for the spark plugs will give you the option of using one for the center coil wire at the distributor (where it gets pretty crowded).
When cutting the boot from the tree, a stem remains to insert into the head's spark plug hole (use a #70 drill bit).
The hollow end accepts Pro Tech's Spark Plug Wire. Pro Tech recommends drilling the boot hole with a #74 drill bit (see their instructions on the back of the header card).