TrailBoss the photo upload isn't working at the moment, easiest way is to drop your photos onto  imgur.com/  and use the link button or press Ctrl+k and post the link to your imgur photos.
Hope that makes sense.
Pete

Are the other brackets for the hinge pins on the new seat pan in the same place/orientation as the old pan?

Also the rubber pad locations?
 

He put pictures in post#1 now
  Does the bracket not fit your seat bottom?

On the last picture, you’re going to have to elongate the left bolt hole on the latch side because it’s on there crooked. You have to make sure that you also have the hinges loose when you line everything up. You have to elongate one of the holes on the latch.

If you look at the picture, there’s more meat
on the left side underneath the bolt - than there is on the right side.
asco
 

I have some latches off both CT and DT bikes. I believe the CT ones are not as tall. Can send you a pic if you want me to.

Many seat restorations the rubber bumpers are not contacting the frame rails until a riders weigh is on the seat. 

asco

If I could post the pictures here I would. I thought they were all the same also.