[Healeys] BJ8 Fan Belt

[Bob Brown]

List,
I'm putting a BJ8 together slowly. I have installed a Lenschow alternator conversion and purchased a fan belt from one of our leading suppliers. 
I simply asked for a late BJ8 fan belt, the alternator intructions imply to use the original fan belt. 
Today the new fan belt is agood 1/2 inch short of being installed. 
Does anyone have a NAPA part number for a fan belt to fit a late BJ8 with an alternator?
The belt I have is labeled 77x1100, 77 seems good but not the 1100.
Bob
BJ8 going together slowly
BT7
AN5