I'm not sure what the correct part number is for the belts but if the Y fits and the X doesn't I'm going to guess that you have the right parts. My belts were also a bit loose but not quite as much as yours. There is a screw in the wooden block that you can use to tighten the tension on the belt a certain amount. But that requires a lot of disassembly work. Instead if you can get some wooden clothespins with the spring - that spring I'm told is perfect for a tensioner and what is found inside the UM2 blocks (maybe?). Place it at the opposite point on the belt from the block.
As far as losing steps on each layer - that problem is indeed unrelated. It is giving you leaning prints, right? That is caused by either the short belts rubbing against the wood (it can be subtle - look to see if the belt twists opposite directions when it reverses direction) and the fix is to add a shim or spacer to move the belt another 0.4mm away from the wood.
But much more likely your set screws are not tight enough on the pulleys - particularly the 2 on the short belts (on the motor and on the other end of the short belt). Tighten the hell out of these set screws. In fact you may have gotten alternate (shiny) set screws among your kit that are pointier and work better than the default ones. But I just stuck with the default ones (black) and tightened the hell out of them. You should be tightening these more than you think you need to. Your tool should be twisting slightly. If you were to use an L shaped allen wrench your fingers would be hurting after. More info here:
http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#leaning
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nilrog 103
Something must be really wrong if the belts are that loose. On mine, before I switched to GT2 belts, they did not require any additional tension.
But there are tensioners supplied with the printer...4 small spring-tensioners.
Although based on your description I don't think they are enough.
I would contact the reseller and ask for help or new belts.
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