So, I was trying to find the correct serpentine belt for my engine since I'm keeping the hydrofan setup. So, I went to the local AutoZone and first ordered up the 2jz belt (thier part #760K6) and it was too short by just a little...I've heard of people stetching it really really tight and it works...but I went back and got the next size up pt# 770K6. Perfect fit...so FYI Duralast pt number for 1jz serpentine belt w/ hydrofan is 770K6.