Pre 1979.5 latch mechanism bolt pattern. The 3 bolt hole pattern is slightly different from the 1983 pattern below.
The main difference is the lower 2 bolt holes.
1983 latch mechanism bolt pattern. I will alter the 2 lower bolt holes so the door will accept the Pre 1979.5 latch mechanism.
Side by side comparison. Note the 2 lower bolt holes in each pic. The 1983 door will require drilling to accept the Pre 1979.5 latch mechanism.