Thanks for sharing that guys. I did some reading on the SQG-1 and QGBa sonars. They were pretty terrible, which I think the Navy realized, prompting the switch to SQS-23. Unless there was some reason that you absolutely have to stick to that configuration, I would recommend bypassing the double configuration and going with the single, more powerful set.
SQS-23 or anything like it was not available in 1952 though, let alone for export, so I do not have this option.