OK, I think I see what you are saying. In your photo of the MC front view, the spacer you are talking about is on the rod swivel where it mounts to the brake pedal lever. Since the new MC is more to the passenger side, this moves the MC piston rod out so that it is in line with the new MC . Is that correct?
Yes Jim. The secret is just mounting the bracket to the original MC bracket. This will make it appear as if the shaft is too far out, but the way they compensate for that is a 3/8 ID by 3/4" spacer and a long bolt to make it all line up. SO, the shaft is too far out, then a bolt goes across with the spacer to make the connection. Am I making sense? Look at my bolt bucket pics and you should see what you are looking for. Should be on the last page. If not, let me know. I will try to explain further.