M6348 Stacking with CX4 to PowerConnect 70XX switches w/ CX4 expansion modules.

Hi there, 

I currently have a stack of Dell PowerConnect 7048P switches. They are using the CX4 Stacking Cables, and have the expansion modules installed.  So I have 4 Stacking cables going out from each switch.

I want to add a blade server into the mix, with M6348 switches.  However, each switch has only two CX4 stacking outlets.

How do I go about stacking M6348 with a PowerConnect 7048P stack that are using the expansion modules?

I understand that you can get two M6348s, in Fabrics A1/A2 for redundancy. Would the second M6348 effectively be the expansion slot for the CX4?

Thanks.