Ballast wiring help!

[lobsterotomy]

So, one of my ballasts died in my Sfiligoi Stealth T5HO fixture, so I got myself a new one (Sylvania ballast). Opened up the fixture just now to replace it and then I had a "WAT?" moment.

You see, there are 7 leads on the old ballast on one end. But only 6 holes in the new ballast.

Two ballasts are on each plug. That being said, I thought this would be straightforward. Perhaps not.

Any help? The old one is on the left, the new on the right. I'm also not particularly electrically minded.....

 

[alton]

On the old ballast cap off #7 and move #6 to new ballast #4. Old ballast #4 to new ballast #6. The rest is same # old ballast to same # new ballast. I could not tell is your new ballast programmed rapid start or instant? Programmed rapid start ballast help lamps last longer.