[Short 3/4]

Assuming that the 63 uses the same ones as 64,5,6 which is what I'm familiar with, Be aware that the top and bottom ones are slightly different. Factory bottoms have a divot to clear the rivet, while tops do not. Some aftermarket ones do not have this feature, so is worth paying attention to. A correct bottom will work fine on top, but a top will not fit well on the bottom.
Hope this all makes sense,
Tom