What’s the difference SW Motech crash bars?

[Pat J]

I am replacing the crash bars on my GS after a little off the other week.
I have been looking at the SW Motech ones when I went on the website they list different bars for the GS and the GSA. These have different catalogue numbers as well.
Does anyone know what the difference between the two is, as two places I have rung to order them say they can only get the ones for the GSA.
All help and advise appreciated as usual