Agree with Thor, with the exception that I wouldn't call the one at the complete right kabeala. It's a short sword or golok from Sumbawa. Kabeala are from Sumba IMHO.
Second one in the line is a short pedang from Sumatra IMO.
Can you post dimensions please? Either the two on the left and the golok from Java are very short or the two sewar are very long.
The first sewar don't need to be from the Batak, I doubt a little bit.
I think the ivory at the Sumbawa piece is hippo tusk.
Very nice pieces!
Regards,
Detlef