The other episode of 'The Invaders' filmed on Warner's backlot was 'The Miracle'. It was set in rural New Mexico, and all the town scenes were filmed in the old street behind the church. Only the lower half of this street ever appeared in Dukes, and the buildings disappeared years ago, but I've mentioned it a couple of times so I thought I'd include a few pictures. I posted an aerial view from 1980 at the end of this post if you want to see how this location relates to the square.
The first picture is from the northern end of the street, and surprisingly there's a few Hazzard buildings hidden in there. The circular opening at the top left is on the back of the church, the building behind the "Harry's Bar & Grill" sign is building #13 (the front was remodeled before Dukes was filmed), and the one to its left, that appears to be "Roger's Drug Store", is building #12. Building #15 was built where the furniture store is in this view.
This picture shows the other side of the northern end. I don't know if the store with the Stars and Stripes became building #16, or if it was knocked down and replaced.
This picture is about midway down the eastern side of the street.
The final picture, from near the end of the episode, shows the hotel at the southern end of the street. This was probably one of the dilapidated buildings seen in the background at the end of 'The Hack of Hazzard'. The girl in the doorway is Barbara Hershey near the beginning of her acting career.