I keep this spare in the trunk which IIRC an Edelbrock rep linked me to either in one of the threads or PM:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I find Google more useful to search this site. Example of what to type in Google search bar:
edelbrock belt site:ft86club.com
Which yields:
https://www.google.com/search?q=edel...obile&ie=UTF-8
In one of the results I see you need a different belt part number if you have a different sized pulley.