Fill that annoying little gap in your case with something useful - a simple, dual passive attenuator in 2HP.
It'll .... attenuate your signals whilst taking up very little space. Not much else to say, really.
Measures approximately 15mm from the rear face of the panel to the board, making it ideal for skiff-type systems.
Supplied with a laser-cut and engraved 2HP panel made from 3mm opaque black Perspex - mounting hardware (M3x10 machine screws) is included. No power cable because the module is passive ...
If you want to fab your own panels you can get the design files here: https://bitbucket.org/yorkmodular/eurorack-panels/src/master/at2-panel/