Couple of weeks ago, during one of our infrequent winter snow storm events, my alt belt broke. I had a spare contitech 10x1170 belt in the van and swapped it over. Now I need to buy another spare. What I thought was, that the correct size was 10x1165 ( or 1168?). Obviously I’m unsure. The 1170 length fit fine, could tighten it to spec.
Is the correct size 10x1165?

Thanks 

Alistair