RCU Forums - Where so I find Info for a Cirrus HS-874 Receiver?

This is a 7 Channel AM receiver, but I can not find anything about. It's as if it never exsisted. I was hoping to identify which plugs are channels 5, 6, and 7. Channels 1-4 are marked, but 5, 6, and 7 are not. The RX has about 4 inch wires with a plug at the end of each. Each plug has 3 wires with one of the wires being a different color for each channel. If I had at least a AM 6 channel radio, I could identify them. No big deal if no one knows about this. I could just wait until I get a 6 or 7 channel TX. However, I thought some one might know or might have one. The remaining colors running to the 5,6, and 7 channels are green, blue and purple. Which goes with which?

Also, I have a 5 channel Cirrus TX that looks identical to a Futaba. The plastic case is the same and parts interchange. Did Futaba make Cirrus products?