will these rims fit my 69 dart custom

If those are the same wheels I saw on the gray primered Dart, they aren't SRT wheels. Those are R/T wheels. SRT8 wheels are 20", I'm betting your's are 18's.

Do this, throw one of your wheels in your trunk and find a wrecking yard that will let use their bolt circle gauge to check the bolt pattern on your wheels. That will settle the question about what bolt pattern your wheels have. I'd be curious to hear your results.