I thought it was the Nissans?
By the way, I believe that then-SBS bought many other
air-conditioned buses at that time too. I recall hearing about the
Renault bus, and there was also a B10M with Van Hol (is that the
right spelling?) bodywork - that was the first ever B10M bus in
Singapore, if I'm not wrong. I'm curious as to whatever happened to
them later on.