1969 Dart which seat covers?

Getting real to order seat covers for my 69 Swinger 340, looking on Legendary's site they show 2 different styles of covers . One for 69 Swinger and Swinger 340 and one that is for Swinger and Swinger 340 and also Valiant 100. How do I know which one is correct for my car? Color is black ,no headrests, car was very basic have fender tag no sheet.