Some of us have had a hard time finding the correct center floor pan support . Most of them have the seat belt nuts in the wrong place. These are the wrong parts. I have ordered from several companies and found Year One has the most correct part. Like a dummy I lost the part # , but if you ask for a 1970 to 72 and look at there picture on the web page you can see the difference . Now the outside nuts are still going to be in the wrong place , I just cut the welds with a die grinder and removed the nut , once I weld the brace into the floor I'll drill or die grind the hole and reweld the nut in place.

 

Nice thanks for the post and pics...very helpful