The aluminum arm braces are LAW36 and LAW37 I believe. You could also get the red aluminum ones from the TF5 touring car which are pretty much the same. I have the LAW36 rear bumper but the TF5 braces on the inner positions.
Other upgrades you might want to consider are
Ceramic diff and thrust race balls (from Atomic Carbon)
Delrin hinge pin sleeves
Hex head screw set
All these changes will make the car longer lasting, smoother running and easier to work on.
As for your Li-Po battery, I have a Core-RC battery which is quite bulky. I had to remove some of the chassis protrusions to get the Li=Po to fit snugly. I have not seen the Orion version so I cant say for sure but it sounds like the same will have to be done to yours to get it in there.
Hope this helps.
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