Measured from the bottom of the seal hole to the tab is 6" on the left one. 6 1/2" on the right. I bought it because it said it was an 8' balancer and had my date, but looking through all the info I could find in books and here all the 8" ones had the tab mounted below the timing marks as the one on the right has. Must just be the plain old 7" one. If anyone needs the 5-68 date let me know.