The Bottom ones are same 70-74 and the AMES version are the only correct ones I have seen, so far. Their hardware is way off that comes with it.
Check out a couple videos I made on this subject.
The core support and mounting it 6 min 20 sec >>
https://www.youtube.com/watch?v=t9DtbP4ez2A
The mounting hardware > 1 min 53 seconds.. >>>>
https://www.youtube.com/watch?v=bHJLaqe-qnQ