Drum Brake differences between F-bodies

[Flowjoe]

In a Firebird related discussion it has been suggested that Camaro and Firebird used different spindles and/or hubs to give Firebird a wider track.  I had always been under the impression that the two cars shared components in that area.  Are there any known differences between the two cars with regard to drum brake spindles and hubs?  I have some Firebird parts (hubs from a '67, a hub from '68 and two spindles from '68) and I do have a fully assembled '69 Camaro drum equipped sub-frame (just not in a position to disassemble right now) if we want to do some comparisons.