I cut 1-1/4 inch out of the rear part of the roof and need to cut the same from the length of the window
I did this a different way then I have seen anyone else do it
I cut the blazer roof off and grafted the sub roof in three pieces to the blazer. using the rear door jam as the back part of the blazer door jam.
hills hotrods and every other swap like this I have seen adds about 2 inches to the length of the overhang behind the wheels to fit the sub top. and they keep the blazer roof with the sub roof grafted to it