SNMP and RB912UAG

Hello all,
i need some help to solve a problem with snmp mibs.
I have some RB911s and I can display in a simple web page, with some php scripts, the
TX/RX signal strenght, frequency, MAC of my peer, etc.

Actually I use the following mibs and all working fine with RB911 :
“1.3.6.1.4.1.14988.1.1.1.2.1.8”, for TX rate,
“1.3.6.1.4.1.14988.1.1.1.2.1.9”, for RX rate,
“1.3.6.1.4.1.14988.1.1.1.2.1.3”, for Signal,
“1.3.6.1.4.1.14988.1.1.1.1.1.6”, for Peer MAC addr,
“1.3.6.1.4.1.14988.1.1.1.1.1.7”, for Frequency and
“1.3.6.1.4.1.14988.1.1.1.1.1.5” for SSID.

But I also have a RB912 with an additional mini-pci wireless card, so I have two radio interfaces.
But if I issue the above “commands” I get get back values for both wireless interfaces, or only from
the onboard wireless card.

So, for the first 4 mibs, I get values for both wireless interfaces and for the last 2, I get values only from
the onboard radio, not from the addon wireless card.

The question is : How I can get the data from only one radio card (the one I want or choose) ??
or to be more specific, from the second add-on radio card ?

Thanks, Fanis