my application is the red one shown above and 70.5" is NO WHERE near long enough to get around that diagram. A 72 5/8's was about 1/2" short so I'll try a 73.1 or .2 tomorrow.
As I thought the 73.1" was a perfect fit for anyone looking to do the same. Mind you there'll be some stretch so you can go 72.8 - 72.9 but the 73.1 will be easier on the altenator. The 70.5 shown above in the 'red' example must have been drawn up just before that guy was karted off to a rubber room