I took the master cylinder off the booster and measured it, it is a 9" booster, not counting the flange. Believe me, I have tried to post a picture but it is too large. In the past I have tried to post pics but have had NO luck doing so. I have pics of this booster, all you have to do is E-Mail me! I don't think that's so hard.
As to what it came off of, I have no clue. I got it in a Mopar deal for some other parts. The guy said it was a Chrysler part. Any other questions Please E-Mail me.
Regards,
Bill