Curious to see if NGK said anything about custom lengths.
They DO NOT make custom length wires, IE Universal wires, in this regard.
Their quote ....
"Frequently Asked Questions - NGK Wire Sets
Q: Are NGK wire sets universal?
A: NGK wire sets are custom manufactured to the exact dimensions of the application. There are no universal sets. Additionally, each individual NGK wire is labeled for the particular cylinder number for virtually fool-proof installation."