Try the device details page and from there choose the network assets tab. That shows the stack members at least for the HP A-series switches. We have the basic version of IMC (JG747AAE) with the latest patch iMC PLAT 7.1 (E0303P13)
1 HP A5120-48G SI Switch HP A5120-48G SI Switch(Master) S/N number 1 REV.A 5.20 Release 1513P62 163
2 HP A5120-48G SI Switch HP A5120-48G SI Switch(Standby) S/N number 2 REV.A 5.20 Release 1513P62 163
Like so.
Hope this helps.