My engine is out of the car now so I can't take pictures but this is what I used and how it looked (not my engine)
Spectre Performance 18483 , Wire Separators
I run these plug wires and one boot touches the header but after 2 years it shows little effect on it.
Summit RacingĀ® 8mm Ignition Wires SUM-867807
View attachment 1715270286