Sigtronics SCI-S4 or S6 Stereo Intercoms

[SkyKing]

We're looking at swapping out the existing SPA400 monoaural intercom in our P337 and replacing it with the newer Sigtronics SCI-S4 or SCI-S6 Stereo unit. Has anyone done a similar swapout? Wondering if the newer unit will fit the same slot without modification? Looks to be a slick unit.

Also, since we're presently using David Clark 10-30's (mono), will plugging these into the newer stereo jacks result in only one-side audio in the headset? Stereo headsets will be on the agenda later on, but just want to make sure the 10-30's will work for the time being.

SkyKing