need case holder with screws

[totalwise]

I opened up my BCE a couple of times to reattach the hands that kept falling off for a while, as a result I've lost the tiny screws and flat rectangle pieces with holes in them which keep the movement from moving around.

I have one left and the stem does a good job of holding the movement in place when it's closed, however when I unscrew the crown,the movement and dial wobbles a bit inside the case.

I'm sure these minor parts should be easily found in the open market, any recommendations on where I can get it from?