Is it possible to order extra spacebar metal stabilizers? I just ordered 2 keyboards and 2 repair sets. But I know from experience that these metal wires can be problematic, so they are my main concern.
Or will the ones from Unicomp also fit (if shit hits the fan).

To make sure the wire is fully within tolerance, I recommend ordering them from me. Though I recommend ordering the space bar itself too because those little tabs that hold the space bar can snap off when you are putting in the wire. If you order the extra space bar you get the wire too:
https://www.modelfkeyboards.com/product/new-custom-legend-keycaps/
For just the wire feel free to order 2 units of the store item $1 increments.