I stumbled upon a Unicorn Electrical Products meter base today. (Never heard of that name before.) Well, I found out that Unicorn was bought out by Milbank and I called the Milbank rep to find out what type of breaker this meter base would accept and still fall within the guidelines of UL listing, etc. The rep was great, he even said he would provide me with labels if necessary. Kudos to the Milbank for hiring this guy; he even knew the model number of the unit I was dealing with before I provided it to him. He knew it just by the way I described it. - Anyway, he said just about any Siemens or BR series type breaker is acceptable. In my opinion, this is valuable info for anyone who might run into this in the future... Just wanted to pass it on.