Do not use Dayco 15275. Use Dayco 15270. It is 1/2" shorter. I found out the hard way. When I put on 15275 I had the tensioner maxed out and it was still loose. The numbers with Dayco are by length to some degree. Every last number down by 5 is 1/2". I do not know how this is effected by using a turnbuckle to add tension instead of that stupid design it has.