Ken - I looked at that pouch when I bought my ACR ResQLink and went with a different pouch. The pouch I decided on attaches firmly to my flotation vest and a lanyard connects the PLB through the pouch to the vest itself. Floating is nice, but a lanyard will keep the PLB attached to you.

I don't recall who made the pouch, but it fits extremely well. It looks and feels like something Maxpedition would make.

Probably not much help; it's been years since I bought the PLB (battery due in July) and simply don't recall.