Hi all. New member here from Maine. I recently purchased a 70 Dart Swinger 340. 4 speed car in very nice shape. I’ve been working on decoding the fender tag ( with lots of help researching posts here) and have a particular option code that I can’t locate. It is B10. Doesn’t seem to show up with any identification, but it’s very clear on the tag. Car has the bench seat and rallye dash , if that helps. I see that B11 is for front disc and 11 inch rear drums. Maybe brake related?? All other codes make sense and tie to the car. Appreciate any help you can offer. It’s a Windsor car, USA spec also. Thanks!