The belt on my 2007 +4 Duratec is 6PK1340
That seems quite long, I suspect you may have hydraulic power steering, either that or your early Duratec Plus 4 has a different pulley setup to my 2012 model?
I can 100% confirm PK61305 fitted perfectly on Monty, and Doug confirmed his spare is only 1mm longer (PK61306), so this is definitely the size to fit to a Duratec Plus 4 without power steering.
![[Linked Image]](https://i.ibb.co/NnGxck9P/IMG-20260611-WA0018.jpg)
My original belt didn't seem to like a sustained track workout yesterday at Castle Combe, when Monty's tuned Duratec saw many laps where we took the engine over 8,000rpm

In it's defense Monty's original belt was 14 years old, but I will be carying a spare from now on. Many thanks to everyone who stepped in to help during my hour of need, especially Doug who's confimation that his spare belt was PK61306 forced me to look again at how my replacement should run

Dave (& Monty).