1969 Dart Swinger Seat sliding rails??

Hello! I am new to the Mopar community after purchasing a 1969 Dart Swinger. The car came with a rear bench seat and front bucket seats. The buckets I have in the car have slider rails installed that DEFINITELY do NOT fit the mounting pattern of the car. From my measurements, I have the mounting holes in the floor at 12-1/2" x 12-1/2" for the buckets. The rails on my seat have holes that measure out to 15" x 15".
Does anyone have any information on brackets I need to fit the rails to this car or if this was even an option on these cars? I have seen other slider rail kits for a few hundred dollars a piece and would prefer not to purchase something I already have....
Any help would be greatly appreciated!!

also any one who can help me understand how to upload images.....that would be sweet!
Welcome to FABO. I can't help you with the seat tracks but I can with the photos. Click on the "upload photos" button next to the "post reply" button you used to post your reply. Choose the file and photo from your computers photo file and double click on it. You will see a thumbnail of the image. Then click post reply again.