I am missing 2 of the reinforcing bars for the seat bolts under the floor ,they also have 2 square dimpled plates to reinforce the bolt area are they available after market .
Thanks for the link, but cannot see them there ,I notice not all challengers have them
Picture is an A66 originally done by Bill Allphin in Cincinnati .
See bracket below was it model specific
When the car was restored he used a rusted out SE for parts & transferred the Electric windows,6 Way seats & electric trunk release to the A66
The brackets were only fitted to the 6 way buckets due to the extra weight & stress ,I was using the A66 for reference a lot of parts from the TA i am restoring were missing as it has normal buckets i will not need .
Found the info on the 1970 Hamtramck-historical.com has some good info on the site