Well, I would say that the black deck there looks to be a 42" deck from a later model Tube Frame tractor, so I'd say it probably goes to the G12. (Unless of course it is actually MUCH bigger than it looks in the picture? - Then maybe it goes to the H16?)
The green deck probably goes to the 1220 tractor. It also appears to be a 42" deck. The 38" decks had a shorter, more squared off discharge chute than the 42" decks.
I would say it looks like they both have most of the hangers needed to mount them up to your tractor, but I'm not entirely sure. The drive shafts are also there, so that is good (usually those can go missing...) The only thing is I'm not sure if you are missing the clevis pins to attach them to your tractor(s) or not.
I believe these should be the correct manuals for these mower decks (mostly just for the parts breakdown):
1st Deck: http://gardentractor...420-01-42inpdf/
2nd Deck: http://gardentractor.../1413-18423pdf/
(It also appears that the black deck there is missing the front anti-scalp roller. No idea what happened to it, but it looks like the whole bracket is missing for it even.)
If it is any help to you at all, there are also some helpful manuals that show you how these decks attach to your mower, which may help you figure out if you have everything you need to attach them to your tractors:
1st Deck Owner's and Installation Manual: http://gardentractor...otary-mower-42/
2nd Deck Owner's and Installation Manual: http://gardentractor...wnersmanualpdf/
Here is another deck installation manual I found as well: http://gardentractor...wnersmanualpdf/
Hope this helps!
Edited by MailmAn, July 13, 2016 - 04:32 PM.