I will try to help. Some recommendations:
1. Don’t lose your mind: if you wish to care for a beautiful old watch, you may have to be patient – and do some research. Otherwise, sell the T17 and go and buy a modern watch.
2. Be happy that the T17 did not have all sorts of variants (which some calibres did!). Otherwise you would already have had several requests for images of the movement (which I don’t see in your posts!).
3. Your watch will command a good price (were you to want to sell it). To maintain that, you might have to spend a modest sum, just for routine help/service/parts – but you won’t lose.
4. I think you’re lucky to find these parts available (many people on this forum have to search for much longer). These prices are fair – I would grab them.
5. I have had good help from Urdelar. Mikael has even given you a diagram with measurements (invaluable!). If you have any doubts, write to him – I’m sure he’ll help you.
6. There are different ways of classifying/listing parts – which change over the years (don’t be surprised to run into different numbers).
7. The 1106 is a generic number for stems – it does not relate only to your T17: it just means it’s a stem.
8. The original part number was 2030 (see attached page from the parts manual which included the T17, GF494) – in French, the stem is ‘Tige de remontoir’.
I hope that helps. Don’t lose your mind – there are many more minefields in front of you.
T17 from GF494 Stem.jpg