Easy solution if your side square holes are in the right spot and this should be a sub $10 fix.
2xcage nuts
1x
Threaded Rod Cut to length
1x
Heat Shrink
Cut threaded rod to about 20" and debur/clean up cut end
Place Cage nuts in side 1 at appropriate height.
Cut heat shrink to 2 pieces, 16" Long and the other 18.5
Place 16" heat shrink on rod centered and shrink.
Place 18.5" Heat shrink over that but do no shrink.
Thread one end of rod into M6 cage nut until clear of hole on opposite side.
Place cage nut side 2.
Thread rod into it.
Center loose heat shrink on rod and shrink it down.
That give you a cheap support that won't scratch up equipment.
If you don't care about scratches you can forgo the heat shrink.
Price, $10 with heat shrink $5 without