Well I've just bought a set of the R32 front and rear ULT pads. The PN's I've given are the ones for the R32 GTR, and they are the only ones that Bendix list. But, if you look at the DBA catalogue, they say that R32 GTR, R32 GTSt/GTS4 and R33 GTSt use the same rear disc (DBA908) and I'd be very surprised if the cal wasn't also the same. I have a pair of the R32 GTSt rear cals with the factory pads in the garage and as far as I can see the Bendix pads are identical.
That said, it still could be they're different [shrug]....