Does anyone know the exact length of a belt on a 5.4 triton with a/c

Belt slipping on my truck and can't wait for one getting delivered from the states so can source one in uk but need to know length. I'm unable to take it off and measure at the moment

 

What year... And do you know the 8th character in the vin number.?

 

2000 model
L is the 8th caracter

thanks