Are 67's boosters different?

[jkade]

The booster is bad on the 67 I bought so I called the parts store and they got me one. When I picked it up from the store I knoticed it looked the same as the one on my 72 blazer. The one on the 67 is smaller in diameter and thicker than the one they ordered and the 72. Nedless to say it didn't work, the rods are longer on the new one and when I got it bolted up the master cylinder would not go back on the studs because of the longer rod. What do yall think????/