you can tell the radios by the RUU #. right nest to the number,ill list what radio is what:
keep in mind: each firmware has 2 radios-one for cdma/3g and the other for 4g. in order to use these radio downloads from this particular page youll have to do 1 of 2 things:
1)perform the radio flash in hboot twice-once for each radio
2) download them both,extract them,zip each image up with the android info text document from one or the other,and then zip them back up to create an hboot flashable file containing both radios.
if you use adrenalynes obligatory radio thread,he has them packed up allready,with exception of mr2 and mr2.5. you can find these downloads in the threads of perfect storm,and many of the gingerbread roms,or the "leak 2.5 radio" thread.
my way of doing the flash would be to find the radios allready bundled,or do #2. if i wanted to do #1,id use fastboot as described in the beginning of the xda thread.
alternatively,one could:
-flash the rom
-pull the battery
-power on into hboot and flash a radio
-pull battery
-put sd card in card reader to swap radio files
-power on into hboot to flash the second radio
-reboot phone
-collect underpants
-??
-profits
tho be aware that finding the correct bundled radio file is the safest,and most reccomended way to flash the radios IMO,as it requires less dangerous hboot flahsing.
hope that helps