Yes, that's almost identical to an AR4x tweeter. They're not the same unit, but very close. They sound OK, but they're not quite as efficient as the CTS phenolic ring tweeter.
As for the 4" driver- usually, the ones that were the Fostex FE103 actually said "FE103" on the rear, and would have been Radio Shack part # 40-1197. But, that may still be a very good clone... or it might possibly still be a Foster built driver, too...
The two 1" dome tweeters and the 4" drivers could be used to make a passable Minimus 7 clone...
BTW: If that super tweeter is part number 40-1310 or 40-1310A, and has the original box, you can probably recoup your whole purchase price for the lot, selling it on "that auction place". Even without the box, you might still have a chance...
Regards,
Gordon.