Perhaps you are talking about the distribution box as used on the M38A1CDN2? If so we had a thread on those over here:
http://www.mapleleafup.net/forums/sh...71&postcount=4
Saturn surplus had them listed, but recently revamped their site so they are not on there now. They may still have stock.
For the most part however, the military replaced all those (upon their imminent failure) with the solid state signal flasher, the green signal arm, and the wiring harness from the Cdn3 Jeep.