Bad news. Broadway is out of business for several years. You can google around, but parts have pretty well dried up. You might find some cartridges, but finding an aerator is slim chance. I am sure the threads are standard, so you can get an aerator, but you wont match the style and finish.
Ingersol Rand...who bought Schlage who bought Broadway.....was trying to maintain warranty parts replacement for original purchasers, with receipt. You can look for them on the internet. I doubt if they will still have an aerator.