Some folks vote for... no, better not.
Okay as a battlefield fix, but otherwise not my style. Call me anal-retentive, but I like cleaning up loose ends properly.
Might try swapping passenger side over to driver side to see if the issue is the box or just aftermarket crap axle?
A lot of work but would be diagnostic.
Don't bother with the junk yard. Those always break from heat and age.:
The H6 uses the same connectors as the WRX. Just call iWire and get a 6 pack. All you need is the housings - you can depin the wires and slip them into a replacement plastic housing. No splicing that way.
https://iwireusa.com/products/black-and-white-coil-pack-plug-kit
GD