The overhead is from June 24, 1964.
The Stemmons Sign had been removed.
The 5th set of lane markers from the east end of Elm appear to match the plotted lane markers.
Moving (JFK within the limo) along the LOS connecting Altgens, the lane marker and the horizontal structure (white in color) = a range from extant z250-z255 to match Altgen's 6.
When i first started to try to match Altgens 6 to a Zapruder frame.
I would open up a large version of Altgens 6, and then go to the Zapruder frames and look for.
(1)-the position of JFK's head, arms and hands.
(2)-the position of Jackies head,arms and white gloves
(3)-the position of connally's head and shoulder during the head turn
(4)-the position and shape of the stars and stripes flag on the front of the limo
My opinion Z-255, but i did also look at Z-254 for a long time