Mdiaz,
With Pad Y of 635 and a Pad X of 470 you should get a small Speedmax. The front end will need to have the short stem, the rise base bar, and a single 60mm spacer and two 5mm spacers under the aerobars. You could do the medium but you’d have to use the TSP to bring the pads back and I think the small would be a better choice.
Ian