As Barry said, there were no two nipple breathers.
The Chrysler name for the part is Crankcase Vent Inlet Air Cleaner and Oil Filter, although the service manuals referred to it variously as a breather cap, or a crankcase air cleaner.
Attached is the page from a 1970 parts book. This is a May 1970 revision, which includes AAR and T/A.
Only 3 breathers were made. One for all cars without the 1970 emission control system (ECS) - one nipple, one for V8's w/ECS - 3 nipples, and one for slant sixes w/ECS.
The purple T/A has the wrong breather.
Bob
AAR 4-speed 3.91, Tor-Red;
70 440 6 pack Roadrunner 4-speed 3.54, Plum Crazy;
68 Formula S conv 383 4-speed 3.23, Electric Blue;
69 Barracuda conv Slant 6 OD4 2.94, 71 B5 Blue;
78 Lil' Red Truck, Red;
70 Challenger S/E. 505 6 pack, Passon 5-speed, 3.55, B7 Blue
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